I guess someone can get lucky after the first try, but others can't get lucky even after 1000 attempts. Nevertheless, slots have a little advantage over in-house(crash, dice) games because you need to wager only 2.5k BTC to get a BFG token.
It's 2,5k satoshis per bfg token, not 2,5k BTC

. But do slots really have an advantage in terms of "mining"? If we compare slots to playing dice with 95% odds. Imho Dice seems the way to go if you really aren't gambling but just mining.