Here's the deal, if you're setting up a charity request you should give me a one time payment option in addition to the monthly options. I would have given something if there were such an option.
Not saying it's not a possibility, just saying there are advantages in not offering a one-time donation. If you still want to give, I'm sure he would accommodate you, if you contact him (he's very friendly).
The reason I'm going with subscribers and not advertising the other option just yet is for the reason jonsmock mentioned.
Nonetheless, thanks for the comment because it confirmed my guess that people might want that option...