Well, not in it too mcuh for the money.
In fact, when i first started two years ago, i spent well over $1000 on hosting, software, etc. just for my warez site. Donations were never enough to cover it and I didn't run ads at all. So it was just a hobby.
Now however with my Hosting Cost in the $200+/pm, and me without a Job. Ads are a must. I used most of the money for Hosting and other site needs.
The rest of the money are for kept in savings just encase of an emergency.
Occasionally though, I buy some stuff on ebay, but usually they're just books and stuff for my studies.