Category campaigns, not product campaigns
Both lines got separate automatic campaigns at category level. With a large number of models and sizes this is simpler to maintain than campaigns on individual products.
A footwear seller on eMAG Romania, two product lines. An expensive product for a marketplace, with a long think before buying and clear seasonality. This case honestly shows the dip in the middle of the series too - and what we did after it.
The account started with a few dozen campaign orders a month and a product that costs several times more than the typical eMAG basket. At that price a click is cheap relative to an order, but every mistargeted click is a loss. An expensive product also demands more from the page - alongside the campaigns we worked on the content of both lines, so that the page answers the questions a customer asks before spending ~240 RON.
In the middle of the series campaign sales fell to a few orders a month. The reason was mundane: the season and gaps in the most popular sizes - advertising will not sell a product that is not available in the size the customer asks for.
The goal after the dip: rebuild sales on a full size range while keeping a single-digit ACOS. In footwear returns are frequent, so the margin on an order also has to carry the cost of a return.

| month of cooperation | campaign orders |
|---|---|
| M1 | ~30 |
| M2 | ~70 |
| M3 | 11 |
| M4 | 8 |
| M5 | ~50 |
| M6 | ~90 |
The dip in the third and fourth months is the season and size gaps - the campaigns were deliberately throttled back then. The recovery began together with restocking.
Both lines got separate automatic campaigns at category level. With a large number of models and sizes this is simpler to maintain than campaigns on individual products.
When the best models ran out of sizes, the campaigns were throttled back. Spending budget on offers without a size range raises ACOS and hurts the offer's rating.
After restocking, the campaigns returned with a higher budget on the line that makes most of the value. Campaign sales came back to about 90 orders in the reference month.
We set the maximum ACOS after deducting the cost of returns from the margin. That is why the target is ~6 % ACOS, not 15 % - and the account holds it.
The recovery after the dip and the cost-to-value ratio: about 1.5 thousand RON in campaigns turns into about 21 thousand RON of orders, which means advertising costs about 6 % of sales.
An expensive product forgives a higher cost per click, but it does not forgive mistargeted clicks - category campaigns with exclusions are safer here than a broad automatic one.
Advertising will not fix stock gaps. When the size range falls apart, it is better to throttle the campaigns back than to raise ACOS and hurt the offer's rating.
In footwear, returns have to be included in the ACOS threshold. A single-digit ACOS with a ~240 RON basket is a realistic goal, not a dream.
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