I haven't donated, and I probably won't either, despite having jailbroken the iPad 2. The reason for not donating is that I wouldn't buy it if they charged for it. I donate to developers that produce something that I would pay for to keep, should they not offer it for free anymore.
Although... I have bought apps in Cydia. This should mean that I appreciate the fact that I could buy them, and therefore donate. On the other hand, if I had to pay for the Jailbreak I'd "return" the apps.
Just figured I'd be honest instead of not answering at all. At least I'm not one of those greedy bastards who wants everything for free 😉