One of the biggest mistakes that I notice many players make is that they do not optimise their progressions. So whats this all about?
Lets take a basic 12 step progression for 12 numbers:
1
1
2
3
4
6
9
14
21
32
49
75
with a bank roll of 2604 units. A win on any step should put you in a profit situation. But what happens on a loss? You lose 2604 units obviously, but how long would it take you to recoup the loss and get back into a profit? With the above progression, on AVERAGE you would recoup your loss after 363 wins. which is a long way to go. But by optimising your progression into larger wins and not just making a profit after each step, you can drop the recoup phase down from 363 to say 200 which is a much better way to play (you will however need a slightly larger bankroll)
Something to also consider is to miss 1 or 2 steps of the progression by waiting the step out. Now instead of playing 12 steps, you only play 10 steps at a lower bankroll and a higher optimisation.
My aggressive system has an average recoup of 30, so if I lose my progression, I make it up in 30 wins (which has not happened thus far) I have won almost 2000 sessions without a losing one, which equates to about 60 bank rolls.
The morale of the story is to optimise your progressions so that you recover any losses in as few wins as possible.