pozwole sobie zacytowac bardzo dobrego posta napisanego przez mpethybridge. Ponizej tylko fragment ale mysle ze da ci odpowiedz na to pytanie i kilka kolejnych
Here is how it breaks down by position:

I fold the BB about 88% of the time. I fold the SB about 86% of the time. I lost a total of $12,856 folding my blinds preflop. I won a total of $1686 from the blinds without seeing a flop, and I won another $4293 when I saw the flop. This yields the blind losses, $6877, that show in my position stats.
These losses result in a blind loss rate of -15 big blinds per 100 hands I play in the small blind, and -44 big blinds per 100 hands I play from the big blind. These loss rates combine to be -59 big blinds per 100 orbits, or -.59 big blinds per orbit. This stat would be reported in Poker Tracker as -0.075 ptbb/hand and -0.22 ptbb/hand.
The bottom line is that for me, the blinds are a 6 bb/100 hands played drag on my win rate.
Thus, my overall win rate of 6.2 big blinds per 100 hands played represents blind losses of 6 big blinds per 100 hands, and non-blind winnings of 12.2 big blinds per 100 hands I play.
To be honest, my win rate is on the high side for a player losing -59 bb/100 orbits from the blinds. The reason I have this win rate despite my high blind losses is because my early position win rate is a bit on the high side (small sample variance is affecting all of my stats at the moment). In fact, it is difficult to achieve a win rate above 2.5ptbb/100 (5bb/100) if, like me, your blind losses are -59bb/100 orbits.
Most players have positional win rates that look something like this:
SB: -20bb/100
BB: -40bb/100
EP: 8bb/100
MP: 12bb/100
CO: 20bb/100
BTN: 26bb/100
Which yields a win rate per orbit of
SB: -.2
BB: -.4
EP: .08
EP: .08
MP1: .12
MP2: .12
MP3: .12
CO: .2
BTN: .26
.38big blinds per orbit or 4.18 bb/100 hands, or 2.09 ptbb/100.
Look at it another way. If your win rates are comparable to these, then every orbit, you are playing UTG, UTG+1, MP1, MP2, MP3 and 40% of the cut off just to pay for the red line losses you will take folding the blinds. Your profit can only come from the button and a portion of the cut off.
Marginal changes in your blind losses can have a big effect on your win rate. If you trim your blind losses from -60 to -52, UTG becomes a profit center for you, and your win rate goes from 4.18bb/100 to 5.06, and you become a 2.5ptbb/100 player. If you play 50,000 hands per month, that adds 4.4 buy ins to your monthly profit.