How much money can you make doing webcomics?
If you’re Dorothy Gambrell of Cat & Girl (compete.com places the readership at a respectable 50K, which was up considerably from previous months), roughly $10,000 for six months ($20,000 for the year according to Sean Kleefeld.) That’s income only, and doesn’t count expenses.
From Brigid Alverson:
In one way, Gambrell is living the stereotype: Her biggest source of income in most months is T-shirt sales, although she sold a lot of books in August. Freelance work also gives her a boost. The bottom line: So far this year, she has taken in $10,087.56 from her comic, a respectable second income but not enough to live on. And that isn’t her net—she has yet to deduct taxes, PayPal fees, and other expenses.
Not enough to quit the day job. Here’s Wikipedia’s list, by the way, of “self-sufficient webcomics“, i.e. ones that the creator can live off of.