We were the first company to list to multiple venues. We added Amazon.com and Yahoo back in 99/2000.
If Amazon, Yahoo, and Microsoft can't make it I have my doubts about Wagglepoop.
Sellers complain a lot about eBay but they never put their money where their mouths are. For that reason we're eBay only for now. Maybe in a few years Wagglepoop will have some significant # of users and listings and we can reevaluate then. I've been down that path enough times to know when to call it quits.
I'm not saying sites like these won't for you. They won't work for us though without many many sellers using them and right now there isn't enough.