We do actually have a section here on the forum where you can buy and sell stuffs online, and have BTC as a mode of Payment. Check out the "Marketplace" section of the forum. If you're planning to make a business out of it, I'd say make BTCs just an option for now, and use digital currencies as a mode of payment primarily. Not all would be open to pay you in BTC, but if you just include it as an option, others would have the freedom to choose (Of course, BTC payments would be better since it'll be like an automatic investment).