Fluffy-seme on being realistic about earning money, via donations, in web fiction:

People might give you a few bucks if you wave a picture of starving African babies in front of them (or in this case starving artists I guess), but they’re more likely to resent you and never give again unless the process of giving makes them feel validated in what they already believe. In fact, having worked as a canvaser in my younger days (just about the most horrible job you can have in fundraising) I’ve noticed guilt often makes people quite hostile towards you instead of charitable.

Well worth a read, but note: donations aren’t the only business model available to writers of online fiction. Nor is it at all reliable, and that is common knowledge: busking has never been anyone’s idea of a stable income.