If anything, I'd say a fundraiser to help with medical bills is one of the more financially responsible things anyone (and especially a camgirl) can do. I'll admit that I don't know much about healthcare outside of this country, but I do know that medical bills are usually very high, unexpected and a result of something that usually cuts into your ability to recoup the financial loss, especially for a camgirl who doesn't have any kind of safety net if she can't do her job.
I don't even feel that this case can be categorized as begging, in my opinion, this is recognizng that you need help and asking for it from the people who care about you. It's something very personal to talk about with total strangers, doubly so on the Internet where it's even easier to just point and laugh at the misfortune of others and not suffer any of the consequences. So on top of responsible, it's brave as well.
I realize that camsites are a means of escapism for many people, but if I see somethng happen to one of the models I follow regularly (because if I follow you regularly, I'll notice that you've been gone a while and probably also follow you on Twitter where I'll have seen an update), I'll usually want to help out if I have the ability to do so. The feeling of being on a camsite is a bit similar to a modern version of going into a bar after work, you talk about your day with the (other) regulars and the staff, you laugh, have fun, it's a social experience. If I were to come up to my bar of choice and find it closed because the bartender had an accident, I'd want to help out as well, because they're responsible for me having had a lot of fun times by virtue of keeping the bar running.
I have to point out that this mainly goes for unexected expenses. I feel any adult has a responsibility to themselves to see to it that their regular expenses are paid for first and foremost. I've gotten criticism myself for allowing myself the entertainment budget that I do, but I always pay my bills on time, I'm always fed, etc. That said, I do agree with Amber that we never get the whole story just from a tweet. A girl partying in Vegas one week may well have been invited there (I mean, my parents just got back from a family event paid for and hosted by my uncle in France, this stuff just happens from time to time) and even a girl with very expensive tastes can be hit with an unexpected bill and, let's be honest here, expensive appliances can come with expensive repair bills if they break. Some people just live on the very edge of their means, some people have trouble controlling their impulses (lord knows I do) and ultimately, I'm in a very different situation than most camgirls. I know exactly when and how much money is going to come into my account, you guys only know the when and the how much fluctuates. Not just that, but for all you know your internet connection could cut out right now and jut stop working for a week, resulting in a significant unexpected drop in income, while your bills still need to be paid.
Wishlists are slightly different for me in that they seem to exist in a kind of void where I forget about them most of the time until something like a birhday pops up. But even then, I can;t see the harm in a girl putting expensive stuff she wants on there. It's a WISHlist, after all, not a list of demands. I don't personally get the appeal of Rolexes (but then, me and watches never got along to begin with) but if she wants one, the wishlist is a perfect place for it. The only thing I don;t want to see is her getting all indignant about people not buying her stuff from said wishlist. I don't mind the occasional remider that the list exists at all, but if I see a "Why isn't anyone buying me stuff from my wishliiiiiiist *cry*" then I am more likely to buy something off another girl's list and respond to the whiny girl with a screenshot of said purchase.