To expand on progressions a bit further, it might be worth thinking about the punter who is exploring the use of, or is trying a progression for the first time. Mostly it is those who are loosing punters, as a winning punter netting profit flat stakes win/place or whatever, is as happy as a pig in mud with what they are already doing.

The loosing punter exploring progressions is searching for a way to turn loss into profit, which is a bit like trying to spend more than you earn without getting into debt [how our society and it's economy works]. In other words the punter interested in progressions is mostly chasing losses though they will rarely admit it [even to themselves].

The only progression that will never get you into trouble is the winning progression. Increasing the bet amount by a progression line after a win and not a loss. Long term of course you will be no better off than sticking to flat stakes betting, but it will give you the 'impression' of being better off. That might be worth something.