Here in New York, I have yet to see a 1850 game. There are 4 main gaming areas as far as cities go. In the city of syracuse, it is focused around winning at all cost, meaning double lash armies and shrike/calgar combos abound. There it is often 1750 battles. Rochester promotes mob lists, not only in 40k, but fantasy as well. The norm there is 2k for singles and 1.5k doubles for tourneys. Both Albany and NYC have a more relaxed, friendly gaming scene, with 1.5k being the general army games.
Those point costs go for the surrounding smaller LGSs. In general, the state seems to be split into north and the further east portion of the state being 1.5k, and the rest of the state being 1750 for the most part.
As my state is a strange one as far as taxes, there is less money here than normal, so.... a lot of tourneys have been running '40 minute eliminations' of 400 point lists. It's a good way to get new players who don't want to spend much on the game.