A wize man on this site once said to me " if you can't beat the fish at $10NL, grandmas, underagers, oldmen, welfare moms and outright beginners what makes you think you can beat better players at the higher levels". Remember, as they start to "respect" your bluffs, raises and pot sized bets so do you. Instead of 8/10 fish at the table, ther will be3/10. Can you find them at the table, before losing your stack? If ya can't beat the lower levels, how can ya beat the higher levels?
I often find myself wishing for more players that play the "right" way (as if I had a grasp of that). It almost seems like you need a couple of rocks at the table to balance things a bit.