I think it's because you're getting involved in so many more hands. Probably some one here can show the math.

The blinds do come around more often which makes it a more aggressive game which I like. I can play fewer tables and still have fun.

The hardest part is how much variance is involved. You're dealing with a ton more barely +ev situations because you have to get the most value out of every hand. I'm also a lagtard which doesn't help the situation much.