Of course that would be a great idea to see some service like Ebay but crypto friendly. Also there's some websites that offer crypto's as payment never had the full support perhaps because of poor marketing. I mean its a niche market, so if you target a wrong audience then your websites will not have any potential customers. So the market is not saturated so its going to be fun so see more websites offering crypto's to conduct transaction. But be sure to cover lots of issues though like shipping worldwide and the duty fees and tax as well.