How about a "Marketplace Lite" with a different URL to keep such things in their place? That would be great.
www.bric-a-brac.biz seems to be available.
A person looking to buy a Blake Bortles mini helmet saying to themselves, "Hmm, maybe I'll also grab a Home Run Kisses" just doesn't seem in the cards, or vice versa. Then again, this strategy of selling everything under a singular umbrella worked for eBay, so there's that very proven track record and my observations are completely incorrect.