Because these guys don't have knowledge or online banking. They have a product on their computer tht somebody wants. they may have uploaded it before so they're part way there. But, if the send the somebody the link and ask for money they want money that they can pick up. Not virtual money.
Here's a tutorial:
1) Once your game is built, upload it to a perminant location (a server that will let you keep it there forever).
2) Get a website, freewebs.com is fairly painless, and build a "store" page.
3) Get a paypal account. If you're not old enough, get someone in your family to set one up.
4) Enter your paypal account information int freewebs.com and you can build a payment page and a buy now button. (it will look a little like
this)
5) When someone places an order, money will be transfered from their paypal account to yours along with an E-mail address that the account is registered to.
6) Once, you have the money and the E-Mail address you can send them the link to the product.
Hope that helps
AE