House edge is there to protect the interest of the house much more than the interest of the gambler this is so that gamblers stand the chance to only win the amount that their luck permits them to win and most times, one needs to look out for ways to prepare your mind that winning in gambling only occurs via luck and nothing else so while gambling never expects a winning.
Without house edge, this business can survive. Without it, I believe, a lot of casinos are already in the bankruptcy stage especially if there are huge amount of winnings.