Wait for 3 or even 4 repeats is one of the oldest 'triggers', 'key wagers' or some title it, 'advantage plays', etc.
It works, but it also fails. I have countless scorecards and actual pictures of real B&M Scoreboards that repetitively show 3s and 4s and some 5s and 6s in most all shoes. But, those 7s through 12s come often as well.
A $100.00 wager on say the 4th spot after a 3 repeat of Players, might just continue to 10. And you better have $25,500.00 to risk for that 11th wager to get back your money and make $100.00!
Then you run into table limits. Almost all $100.00 table will max out at $10,000.00. There are some exceptions, but the norm is $100 to $10,000. $50 to $5,000 and $10/$25 to $1,000 to $2,500. I do frequent a place that is a reasonable $25 min to $5,000.00, but everyplace does not do that.
10 in row happens, it is not rare. Even 8 in a row when you were counting on 3 or 4 or even 5, will cost you a total of $3,100.00 and you will have a total of $6,300.00 riding on that 9th attempt, your 6th try---to win $100.00 and recoup.
You better save up a boat load of those $100.00 wins, because you will encounter times that you get 6 and 7 spots into the run and you are wagering for the CUT to the opposite side after the 3rd one and you will have thousands riding on it.