You can use "Pro Sales" for promoting any type of product or service – all categories are valid. The only criterion that matters is the ad's CTR (click-through rate) – meaning how interested buyers are in it.
If we notice that the ad has a low CTR, we pause the promotion and add a special note to it – "Edit to get clicks". This means that the ad has a low chance of good performance, so the money you spend on it won't bring you value.
There are several reasons why CTR can be low:
1) The set price is higher than the market price;
2) The pictures are low-quality or don’t show the product in full;
3) The description is incomplete or unclear;
4) The title doesn't describe the product well.
You can read in detail about what can increase an ad's CTR here.