We play with anything between 1k to 2.5k here. It all depends on the mood and and such of people.
For instance when I want to play, but feel lazy I try to keep it at 1k.
Everyone here is able to field decent 1k armies, so it's not that anyone is looking for advantages. Besides, when I play at 1k I'm mainly looking for an excuse to field nothing but Saurus warriors.