Internet sales: How much?

[Posav]

For the future of the Internet, possibly in the sale of works by contemporary artists. There are a collector interested in from another continent, so to speak, asked the show, send pictures. It is all done to avoid kidalovo?? Teach, help. Or to advance to accept or require advance payment 100%? And the collector stremno not seeing the original expel round sum. That's what I see the difficulty of selling through the Internet.