I have played thousands of hours at the tables. IMO, the single biggest mistake most players make is they have way too small of a session bankroll for their betting patterns and sizes. Thus unless they are on a pretty solid mostly-winning streak from the start the inevitable ups and downs hits a down on them and cleans them out. Seriously, at table games it is almost RARE that players get up with any chips to cash. Other than "hit and run" types that either play for one deck/shoe or craps players who try to jump a "hot roll" it seems to me that the vast majority of players sit down and start with way too little of a buy-in and then either re-up or leave when it is gone. So few have a win goal or loss limit when playing.