I'd have to say that it happens, especially in 6-max but it could also be from the way you are playing. The fact is that you aren't bankrolled for the stakes with the $10. It doesn't mean you can't play at this level...but the swings, especially at 6-max, could kill you.

Firstly, I congratulate you on your reading...excellent books there. Be wary about playing like Brunson at these levels. Take his part in Super System about playing weak/strong players to heart...simple game, play with strong hands and DONT BLUFF FOOLS!

It may be advisable to play some of the $1 sit and gos on Royal Vegas. You get a lot of poker for your money and whilst the play is slightly different to ring games you could build a decent bankroll with little risk. It's how I and many others started. If you take this advice I'd recommend DavSimon's superb sticky on the tournament board.