First let me say that that I love your show, and really appreciate all the time and effort that must go into each show. I look forward to each new episode. Because I enjoy the show so much, I'd really like to support it.
However, I don't understand why you do not accept PayPal. Even if they charge 5%, if someone donate $10, thats only .50 charge. Isn't $9.50 better than nothing? I was donating every month, but don't like entering my credit card information each time, I quit writing check some time ago.
The other thing that bothers me is making the donations to SIUE. I don't know who's getting the money, I received a thank you letter each month from SIUE, not Astronomy Cast.
Just my 2 cents, accept PayPal, and let the donations come straight to AstroCast. If you could do this, I'd be glad to start back with monthly donations.