Yes, but wasting slots to display items a client already has defeats the purpose, doesn't it. Right now vendors pay to show me stuff I have already bought (and won't buy again)!

That's why I suggested a personalized system, showing to each customer items (s)he doesn't own yet, obviously chosen from the "sponsorized" pool.

 

As for the 3 items, that's the amount displayed. I know there are more in the pool, and yes, I noticed the pool is smallish. That's why I think it wouldn't be too difficult to improve it so it makes some sense for everybody.