I've had ok luck with using this. I do it fairly rarely but have done it.
- As with other posters, I almost always use a percentage that is lower than the "recommended" one, usually 2-5%.
- I almost always do it on low value cards--if you have a $1000 card for sale and you set a 5% promotion, that's $50 extra in fees on top of the roughly $130 they are taking already, and if I actually want to sell the card, I can't raise the price $50 in most cases.
- For cheaper cards, though, it works ok-- if you have a $8 card and it's 3% promotion, I can usually live with the extra 24 cents in fees if it means I get it out of my inventory.
- You can actually look into views to see which views were organic and which were promoted, and in many cases I do see a substantial increase in views even with the low %s. Whether those people are the kind of people who are gonna buy the item is a question, but I am almost using this in cases where the thing hasn't sold on its own for a while, so different eyeballs is almost always good.
Anyway, that's my experience if that helps anyone...
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