PoserPros has a separate product showcase forum and the merchants over there don't seem to be complaining about it. Maybe you should check with them to see what's working for them...and some of them do showcase their products in this forum too.

If this is because you think you're losing sales due to poor exposure...perhaps the problem is a bloated marketplace, too many merchants, too many products, high prices, and only so many dollars to go around. No amount of exposure is going to combat that.