Blackjack21 is a joke, and a rip off. I play every single day, and have for at least 2 or 3 months. At first, it was great. I was winning at a normal rate, not too often, and not too seldom. And, yes, of my own accord, i bought in to the "sales" they had on chips. But I quickly noticed, once i started spending money, my winnings quickly decreased, and the cost of chips doubled and tripled. At one point, i was spending $50+ in a day. I got up to over ONE BILLION CHIPS, just to watch them feels in less than 48 hours after my last buy. And i mean i lost in EVERY GAME. BLACK JACK was impossible to beat the dealer, set poker NEVER had a winning hand, slots never hit a "free spin" or "bonus game" and even Texas Hold em, which was supposed to be played with real people, never gave me any hand, other than a pair that someone else would amazingly beat....i mean, seriously, look up the odds of losing with a full house.....i lost like 50 times.
So, just know, if you ever spend even one penny, you are then required to spend money on a daily basis, or your winnings will dwindle to zero. My advice, just don’t do it.