Usually, every gambling site have minimum bet size less than 1 satoshi, everyone can play it easily. Believe me i don't see any gambling site have in-affordable size of bet, except sports betting and poker. Because only these games need skillful gambler and i know every skillful gambler want to win big bet. I am sure it is not a valid reason, but it is my own thinking, because i am sports gambler and i always want to play more than 1 satoshi and also win big money.