With restricitons on Blackjack profit by many casinos, the house edge on real casinos are above 5% for almost every games.
Real casinos are not the place to go if you are after profit. You can have much favorable environment on online casinos where you can gamble at your own pace. Real world casinos are for fun with friends and partners.
Any casino should be considered primarily as a place for entertainment. It does not depend much on whether it is an online casino or a regular casino. In order to constantly earn money from gambling, you need to play poker, bet on sports and be a professional in this. Because it is impossible to constantly win at the dice game, since everything depends only on luck.