Yeah, I don't understand this.

It's late, so maybe my thinking/math is way off here. But -2BB/100 for 10K hands amounts to 2 buy-ins, right?

Hell, I swing 2 buy-ins ALL THE TIME. I swing 5 now and then, and I've lost 10 in a couple of days before.

What if you played to +2BB for 9,900 hands, and in the last 100 hands you lost four buy-ins to suckouts? That's some sweet variance for you. 10K hands isn't enough.