Thanks fnord and all for the provocative discussion.

One reason that I raise pre-flop in any game is to help establish the
texture.
I generally don't junk it up too much, and I like a game where my strong hands hold up. At my limits, they'll get paid often enough when I've isolated.
Regular pre-flop raising exacts a toll on limpers and it makes them think twice about limping into the pot with speculative hands when I have position.