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Cause TLTR.
Wait until someone who are asking, why wagering on roulette only counted for the money (win or lose). Some people using roulete to cover all the numbers for waggering and realized the total money he was bets are not counting.
The waggering only counted for the money you're win or lose. I also doing these at the first time, and feels stupid for waggering part ~LOL
It’s case to case basis, Some casino count all the bets made and not only the amount you win/lose since I use this method frequently. I still didn’t play on casino that doesn’t count total bets on roulette however on some casino they totally disable any bet that has a high possibility of a breakeven outcome like betting on both side to roulette.
Just like what @shishir said, Some casino just value table games at lower percentage as way to counter those low risk bets while you can accumulate high wager.