[Rod Blagojevich's] wife, Patti, ate a tarantula in a contest with the actor Lou Diamond Phillips in Costa Rica for the reality show "I'm a Celebrity... Get Me Out of Here!" The couple explained that they needed the money.
May you never need money so badly.
All joking aside, mes auteurs, it's important for you to realize that you're not likely to make a ton of money with your writing. It is, in fact, unlikely that you'll even be able to quit your day job; only a vanishingly small percentage of working authors earn enough from their writing alone to support themselves. While it's nice to dream of a six-figure advance and a house in the Hamptons, sadly, that's probably all it'll ever be: a dream.
If you're a serious writer, you're not in it for the money. You're in it because you love writing, because you believe you're good at it, and because you believe your story deserves to be told and read. Sure, it's nice to be paid for something you love and are good at, but you'll probably have to do at least one other thing (something you may not love, or possibly even be good at) to make ends meet.
No one ever said it was easy being a writer. Paying work isn't guaranteed; you may end up being paid for writing you don't particularly want to do; you probably won't get paid a lot to do it. Them's the breaks.
If you're at least comfortable with said day job, you can view your writing not only as a hobby, but as a potential (though relatively small) source of income. Extra money for something you love doing is a pretty nice bonus, even if it's only a few thousand dollars. Sure, it's hard work to finish a manuscript, send out a million queries, secure an agent, get a deal at a house, and help shepherd your book through the publication process, but if you truly love writing and publishing novels, you'll see it through. If not, you're not cut out for this business and should probably hang up your pen/keyboard.
The point, meine Autoren, is this: do this because you won't be happy doing anything else, not because you want to be the next James Patterson or J.K. Rowling (as nice as that'd be).