If I could sit down at every 1NL table with $1,000,000, I would. Unless, I thought I was a below than average player at the table.... hahaha yeah right.

The big stack at the table always have more options than anyone else at the table. First of all, you can play against the 2nd biggest stack in full... more potential there. Secondly, back to the options, you have more of a selection of plays pre-flop and post-flop. Whereas short stacks have fewer moves available to them.

Other than leaving a table because you think you are below than average there, I can't think of one single reason to leave once you've doubled up.