I don't get it... Isn't this stating the obvious? Let's assume you have a dice, if you roll a six, you get 5 times your bet. If you win on a first or second try, it makes sense to stop, from an expected value(EV) point-of-view. But in most of these systems you cannot stop betting forever... So you would start again when things get interesting, which might be the next roll if it is truly random, right? So the only thing they say is to temporarily pause when you are above EV. But when is the best time to start again?