Ouch! You're right. That's not even close to a fair market price. Virtually every paintball operation has a 4500 psi compressor, but not all of the staff are allowed to operate it. Same with scuba operations (notwithstanding the fact that land-locked Alberta is not really overstocked with scuba shops - I know of one in Edmonton). What I've found is that a 4500 fill/top-up can be just as cheap as the $5-$15 3000psi fill as long as (a) you check ahead to make sure the authorized HP person is on the scene when you want to get your fill, and (b) you're understanding of the fact that a 4500 psi fill requires more fill breaks to acquire a true maximum fill. If you're just dropping in for a HP fill, more often than not you'll hear, "We can only fill to 3000."