for the odds of the games their playing and know before hand that winning on the slots is very slim. Their expectation is lower than a slot addict who probably doesn't care what the odds are. Sometimes you'll experience heavy losses at bj and realize that the twenty dollars you have left isn't going to recover your loss. A twenty spent on a machine just might recover your loss when you least expect it. Remember that slots are short term play and bj is long term play.
The danger is that when you win on the slots, you may start to question the long hours that bj requires, whereas you may have just won a large amount in a few minutes at a machine.