@edgarblythe,
Let's say I agree to your terms and send you a ten-dollar bill at the same time you send me a one-dollar bill. What if you decided to keep the ten and then send no more after the first one-dollar bill? In fact, what if I send the ten, and you don't even send the first dollar at the same time, nor any thereafter?
Okay, I'm afraid I'm going to have to ask you to provide me with some character references; and please, no followers from here on a2k.