People that sell weed and some smoke things don't do it but they sell and it's not because it's not healthy they do it but because it's addictive and expensive for them when they try it. Imagine yourself been a owner of making money from the bet shop and then you wasted the money to gamble and you win nothing, the pain will be unbearable and you wouldn't be able to open the shop the next day because in my place where there I no light, you will have to use power generator which means you need fuel.

To avoid all this temptations, some owners of this betting shops employed people to manage it for them since all games are been recorded and can't be deleted, form of stealing and cheating the owner wouldn't be possible. This way they don't have to even stay at the shop, they only come for inspection in the morning and after that, they show up when the representative is ready to close the place and do accounting of that day bets.