I learned that clubs can apparently charge whatever they want for testing, non-member testing fees and hospitality charges.
It makes sense if you think about it - ice costs vary considerably throughout the country, if USFS were to set fixed fees, you would either have the fees be much higher than they are now for most clubs, with a lot more paperwork/hassle involved, or you'd have clubs who can only offer test sessions at a considerable loss. My club's fees seem to be higher than some, but if you break it down and do the math, they're not even breaking even on most test sessions unless they have multiple non-members testing (our non-member fee is $30, I've seen as high as $60 within my region, our hospitality fee is low and basically covers the cost of providing coffee and snacks in the judge's room). I used to be a little irritated at the fees for tests (especially when I tested on a freestyle last summer - with no cost for ice to the club), but then I realized that for my 12 minutes on the ice, my club isn't charging enough to cover the cost of the ice.
The fees charged by USFS to register a test are relatively nominal compared to what the clubs charge to cover expenses, but I doubt there are really any clubs out there that actually make money on test sessions.