What we can learn here is the game needs some luck. We could bet virtual, until a number comes up, and then put 36 and have a 1/37 to win. That means on a fair wheel, we could as well bet 36 units on a single every spin. We slow down the process.

If we use DS, it will take 6 win in a row to achieve the same as a single, or 12 dozens.

We normally do not want to take this risks, so then we try methods like this. If we go for splits, we get 1/4 of that a hit on a single pays. Yes hitting two singles in a row, is 4 times more difficult than a split. A split needs hit on two numbers twice and there are four ways (i.e. 11,11 11,12, 12,11 12,12).

If we stay on DS we will win easier 1 in 36 times (on NOZ), and get paid 36. We do not change any odds at all. But it is easier to get a win using DS. That holds however we play, a DS is less difficult hitting than a single.

All bets are the same odds, and IF we want to go for the big, we can play for a single to hit twice in a row. We pay a chip a spin until we win. If we are very lucky we hit early, if not it may be sound to switch to an other bet, like corner or streets, to save the session, and put a limit how far we want to go. If we put a limit at 144 spins, no sessions will cost more That's 144 units. Compare to negative progressions, this is better.