Thanks nabmom for the flattery, I blush lightly
As for "variance", I realized a while back that in some cases variance comes when you end up sitting playing with a type of player who's style and yours tends to clash, which makes you perhaps play differently to avoid the clash.
I was playing a live cash game the other night, and one new player sat down at the table, and it a bit of an aggressive raiser, wide range, a sort of loosish calling (and raise) station... sitting 3 seats to me left. As I tend to be a little more nit than nut, his openly aggressive play isn't what I generally like to go against. The result is while I still did what I generally set out to do (double up on what I started with in a reasonable time frame), found it less comfortable, I found myself playing less hands, and generally avoiding playing against this guy.
I should note that while he was very loose, he was also one of those guys who either pushes people out of pots with big bets, or seems to be able to suck out pretty much every time. He also rarely calls, even in BB, generally raising. Oh yeah, lots of straddles as well, A hard player to go against, you have to be very certain. Because of his position relative to me, I only had a couple of hands each time where he wasn't involved.
There would certainly be some variance in my place there!