Do you realize that most of the people on here are not old enough to have Credit Cards, so it seems it bit difficult to give donations. Also I think you must be over 18 for Paypal, and I also think Paypal needs a credit card for the money.
I am not sure what you mean by "WebMoney" but to mean that means having a page where people send you donations through Paypal and similar sites, which as far as I know you need a Credit card to put money on the Paypal accounts.
Does it take you long to find the code in the EXE and add it to the tool as a new function?
Nothing wrong wit it. If anyone has a buck leftover, and WANT to give it voluntarily to him, why not. Noon eis forced to. Giving donations is not that unusual for anyone to mock up about him asking. As said, anyones free will to do or not to do it.