You can't imagine how much I love these rewards. It's easy for me to wager $500 by playing blackjack only and I won't lose a lot of money. $10 is enough for me to have lots of blackjack sessions and I get a lot of fun at the same time. I'm gonna wager $500 every week to get good free spins at random weeks.
What type of blackjack you are playing? Live games or the house game? Live games blackjack usually have 5$ minimum which is so hard to accumulate wager by using small bankroll.
However, Blackjack is indeed the best game to accumulate wager safely if you want to play the perfect blackjack strategy.
For me, Plinko is my safest game to accumulate wager.