15 grand is a lot of money, if you worked at a job for 10 bucks an hour, thats 1500 hours, or 38 weeks which equates to 9 months of work. not bad.
But, i do not think they care about the 5 grand or so, they are hoping for a fan base, and sponsorship, which would create much more money in the long run.
also, i do not think evan spent 15 grand, he is probably given most of his supplements, etc...