I have 3 jobs. I work part-time at a bakery (18 hours a week), part-time for a game development company (15-20 hours a week) and I'm a self-employed webdesigner (10-15 hours a week)
The webdesign business is what I'm trying to grow, as it makes me the most income per time spent, is what I enjoy most, what I am best at, and what I feel generates the most value.
However, the other jobs have their pluses too, and I like being diverse. The game dev job is less than minimum wage though, because it's an indie and small budget.
The bakery is nice because it gives me a break from the computer, and nets me a 10% discount on all my groceries :P
Most of my money goes on rent :/ I had to get a place above a certain size to fulfill visa regulations, and thus I am stuck with another six months of paying over the odds on it. Other than that, food takes a lot of my money, since I like to eat a lot of fresh foods. For a while I was getting an organic fruit & veg box delivered, but gave it up because it cost so much
Plus, my partner couldn't work for a couple of months, and he's STILL waiting for his National Insurance number to come through even now... so he couldn't contribute financially.
We also had about £1200 on visa fees to pay, not to mention travel costs to get to interviews and such. Because he got refused entry the first time he came over, we wasted £300 on that plane ticket, plus he quit his job to come >.<;;; So I had to spend another £300 on the next plane ticket....
Etc etc etc!
So, no, life isn't THAT expensive, but I had these additional fees that kept me very tight.