This is 'user generated content' within some brilliant blog coding. There are server costs, moderator fees (?), administrative fees, legal/insurance costs, and much much more that many of us might not know about. Would love to know more about the 'behind the scenes'!
(Full disclosure: I OWE and I WILL get straight with my integrity on this.)
I think that’s key to getting more active donation. Many people are willing to help defray known costs, but they aren’t interested in coughing up for some internet entrepreneur’s windfall. When in doubt, the wallet won’t come out.