Google Ads Management for Shopify EC Sites | ROAS-Based Advertising to Maximize ROIGoogle Ads Management for Shopify EC Sites | ROAS-Based Advertising to Maximize ROIGoogle Ads Management for Shopify EC Sites | ROAS-Based Advertising to Maximize ROI

Why "We Spent on Ads But Didn't See Results" Happens

Many EC site managers who have tried paid advertising share the same frustration: "We spent money but couldn't tell if it worked."

In most cases, the problem is not the quality of campaign execution — it is the KPI used to measure results. When page views or CPA are the primary metrics, it becomes hard to see how much revenue the ads actually generated.

Why ROAS Is the Right KPI for EC Advertising

ROAS (Return On Advertising Spend) measures how much revenue is generated relative to what you spend on advertising.

ROAS = Revenue ÷ Ad Spend × 100 (%)

For example, if you spend ¥100,000 on ads and generate ¥300,000 in revenue, your ROAS is 300%.

The Problem with Page Views as a KPI

Page views can increase without any corresponding purchases. They are useful for content evaluation but are not a meaningful KPI for paid advertising.

The Problem with CPA as a KPI

CPA (Cost Per Acquisition) measures the cost of a single conversion, but it does not show how that cost relates to the purchase price or basket size. If CPA exceeds the product price, you may be running ads at a loss without realizing it.

ROAS Gives You a Revenue-Based View

ROAS directly answers whether your investment is generating sales. Even if you have run ads before without clear results, ROAS gives you a simple number to determine whether to continue, adjust, or stop.

ROAS Is Not Perfect: Real-World Limitations

ROAS is a strong metric, but it does not work equally well in every product category.

For low-priced products — such as blankets or general goods — the cost per conversion (CPA) can come close to or exceed the product price. When competitors have large advertising budgets, bidding competition drives up cost-per-click (CPC), which pushes ROAS down.

In some categories, achieving ROAS above 100% is structurally difficult. When that happens, we report it immediately and realign KPIs together — deciding whether to continue, adjust the budget, or explore a different traffic channel.

Our Google Ads Management Approach

ROAS Target Setting

We set ROAS 100% as the baseline KPI for all campaigns. A ROAS of 100% means the revenue generated equals the ad spend — the starting point from which we optimize upward.

Responsive Search Ads and Asset Optimization

We primarily run Google Responsive Search Ads (RSA). RSA accepts multiple headline and description assets, and Google's system automatically tests combinations to surface those with the highest click-through rate (CTR).

We design assets — headlines, descriptions, and images — based on your product's features and buyer motivations. After launch, we continuously swap in new assets based on performance data to improve CTR and conversion rate (CVR).

Continuous Improvement Through A/B Testing

After launch, we run A/B tests across headline variants, description text, and bidding strategies. Higher-performing ads are kept; underperforming ones are replaced.

Negative keyword management is another ongoing priority. Filtering out non-purchase-intent queries reduces wasted spend and improves ROAS over time.

Keyword Selection Matched to Your Products

We select high-purchase-intent keywords based on your products, brand, and target audience. Ad groups are structured by keyword intent to improve Quality Score and keep cost-per-click under control.

Pricing and Comparison with Other Agencies

Ad management costs vary widely depending on how much overhead is built into the service.

Agencies that hold monthly strategy meetings and produce detailed slide-based reports charge for that time. We skip the recurring meetings and provide a monthly text-based performance report instead. We believe consistent optimization work produces better outcomes than meeting preparation.

Comparison with Other Agencies

	Small/Mid Agency	Large Agency	1mm
Setup fee	¥50,000–¥100,000	¥100,000–¥300,000	¥100,000
Monthly fee	¥50,000–¥150,000	15–20% of ad spend	¥50,000 (10% when spend exceeds ¥500,000)
Regular meetings	1–2/month	1–2/month	None
Performance reporting	Monthly	Monthly	Monthly
Primary KPI	CPA / impressions	Varies	ROAS

In place of meetings, we share a monthly report by text. Questions and follow-up are handled by email or chat.

Pricing

Setup fee: ¥100,000 Covers keyword research, ad group structure, responsive ad asset creation, and Google Ads account setup.

Monthly management fee: ¥50,000/month (10% of monthly ad spend when it exceeds ¥500,000) Includes ongoing optimization, A/B testing, negative keyword management, and monthly reporting. Google ad spend is billed separately by Google.

Enable ad operations in the Marketing and Operations section of the estimate form and we will follow up with details.

Summary

Using ROAS as your primary KPI for Google Ads on a Shopify EC site gives you a clear, revenue-based view of whether your advertising investment is working.

We target ROAS above 100%, optimize Google Responsive Search Ad assets continuously, and run A/B tests to keep improving acquisition efficiency. By skipping recurring meetings and delivering a monthly text report instead, we provide comparable management at a lower cost than the typical agency model.

If you have run ads before without clear results, ROAS gives you a concrete number to work from. Reach out through the estimate form if you are exploring paid advertising for your Shopify EC site.