You need a 2Checkout account to receive money or to add a cart to your homepage for example, but people who will pay need only a credit-card and no account.
Use scriptlance.com You can pay with paypal, and then scriptlance worries about finding the correct way to get them the money. Just go make a new account, post a bogus project, tell your programmer or whatever to accept the project, and pay him/her WAALAA