I have seen a few guys show up with ridiculously expensive airgun setups at the range, including insulated scuba tanks etc. and some of the groups at 100yds are impressive. From what I've gathered it seems to be for folks that didn't get frustrated enough trying to chase rimfire groups at 100yds cause for all the issues getting a good rimfire setup, ammo it likes, and good enough conditions outdoors to really get nice rimfire groups, airguns at that distance seem infinitely more finicky and inconsistent with more voodoo required.