I personally would never deal that way. Most of my work is comissioned. Some of it has been over the intenet. In those cases I have requested a full payment before any work is begun. This has caused me to loose some jobs, but who can be sure if they planned to pay in the first place. I learned the hard way and I will never put myself in a situation like that again. And another note, I would never share 50% of the profit of my work. The only thing I can say is, be carefull, there is a lot going on out there.