Interesting thing I've noticed about myself and giving money to netcomics. Imagine a counter - when the counter reaches 0, I give them money. Good jokes make the counter go down. Mediocre jokes make the counter stay in the same spot. Uninteresting jokes make the counter go up. Missing days make the counter go up a *lot* - I don't care if you have to pronounce "monthly only", but either stay on a schedule or don't claim one. Asking for money also makes the counter go up, depending on what it's for - "give me money because I want to turn this into a full-time job" doesn't have much effect, but "you must now look at this nag strip for thirty seconds unless you've given me money" pretty much guarantees they'll never be getting a cent of mine. (User Friendly, I'm looking at you.)
Basically, the easiest way to get me to pay money for a webcomic is to (1) deliver the goods (2) on time (3) and not tell me I'm evil for not forking over hard cash.
Plus there's a spider dropping down in front of my monitor.