More and more I think NL50 is the level of misapplication - myself included
I think it's the first level where people are really working on the subtler parts of the game. Not to say that people aren't working on stuff at the lower limits, but I think it's the more fundamental stuff, so people aren't spewing as bad. At 50 people are really going nuts with things like Teddie says.
Bottom line is that we are playing the players and not the limit (credit to King Spew for really hammering that home for me). Some 50 tables will be much harder than some 100 tables and vice versa... the important conclusion to that statement is obvious.