This is often seen as an artificial betting strategy designed to produce turnover with variance held to the absolute minimum. It is oftehn used to grind out WR after a big hit early on where a bonus is in play. Most casinos prohibit this strategy for bonus play.
Another use is for a "wager challenge" tournament, where high turnover at low variance is desired. If no bonus has been claimed, this should not really be a problem because even if every competitor did it, the casino would still make a profit on the game.
Those that believe they have a foolproof "roulette system" may try such odd strategies until they eventually find out they were wrong, and the casino has all their money. Casinos that understand the product will not fear this, although those that don't have sometimes cried "system" as though somehow a roulette betting strategy was capable of forcing roulette to pay over 100% RTP.
A niche use (most have now cottoned on) is that if French Roulette is on the standard 50% weighting at a newly launched Microgaming casino, the RTP is great enough for a grind of bonus WR to be +EV because of the French rule variant that if zero appears, half of every even money bet is refunded. This is usually caught as "irregular play", and often results in any winnings being confiscated.
No I am not.
