Most of you leave out the cost of driving. The IRS has estimated $0.51/mile total cost of driving (that's obviously not just gas). For a lot of people, that may be the biggest cost. It isn't uncommon for a reasonably frequent skater to drive 100 - 1000 miles/week, counting skating sessions, lessons, and sharpening. That's $50 - $500 / week.
Most people think of vehicle purchases and depreciation, incremental accident and insurance costs, wear and tear, gas, oil, tires, other maintenance and repairs, washing, etc., as a separate category, so they don't think of this as a cost of skating - but it's real.
Plus, if you don't drive very far to the rink, you may have bought or be renting a more expensive home than you otherwise would, to stay close to the rink. Maybe it even affects your available work schedule, or forces parents to home-school their kids and hire tutors.
I don't remember the exact figures, but he NBC Sportscasters estimated that the high end competitors spend something $80,000 - $110,000 / year. Of course, that isn't typical of most skaters.