Cost. I have a cruddy high deductible health plan. I get a stipend from work but it's not as good as the old "$100 per inpatient day, $50-250 for many OP procedures" plans of yore. I'd wager my out-of-pocket in a lithotripter is far more than a SEASON pass to Disney. And after I recovered from the ride and subsequent blackout, I'd have 364 more days to forget it all!