Blinds are $1 and $2. You raise to $5, the small blind folds and a tight player in the big blind calls.
They check. You have king-high, and they most likely missed too. You bet $6, which needs folds 6 / 17 of the time, or 35%.
You win their $5 and the small blind's $1. Do this a few times a round and it pays for everything else.
A tight player who check-raises has a hand. You fold, and it costs you $11. You didn't need to find out.