The main thing is not to start gambling. An investor is less risky than a player. But still there is a risk, because this is a dangerous business
But I am not seeing gambling business a dangerous one for the gambling owner/investors. I guess gambling industry will turn as trillion dollars industry in very near future itself.
As @Drago pointed out investing in gambling will always be less risky for the investor than the player simply because of inconsistency in how
players bet and that recipe of greed that is always there...It should be safe to invest in established gambling companies provided you do some research
in knowing who you getting in business with!