Putting a cap on how many Bra/Pany sets get into the store wouldn't improve anything, it would costs sales cause they'd just go elsewhere to buy it.

Bra/Panty sets are so popular because that's what people want, therefore capping submissions on it would be counter-productive.  The only reason Bra/Panty sets can overwhelm the store is because it's not designed right, meaning it's not successful in promoting the less popular stuff if it's gotten to the point where people think there's too many Bra/Panty sets.  It's no different in real life, cause if I want, say, a new pair of jeans, I have to walk past panties, bras, lingerie, swimsuits, and all of it is modeled by manequins with the most incredible pointy nipples, so by the time I find the jeans, after seeing all that, I'm not really in the ideal situation to try them on if you know what I mean.

But at the end of the tunnel, there is at least one rack with men's jeans hanging on it!

It's fine by me but at the same time annoying, it just makes me frustrated imagining what will be filling all the bras and panties - and I'd rather see that than see them just hanging there like that.  So even out there in real life, it's no different to what happens on the Renderosity store, cause it's the sexy stuff that dominate the store and galleries just as the lingerie dominates the clothes stores.