3 to 5 percent edge are high but this do depend on the game too .
good games like slots usuall have higher edge but i better play on games or on site that has 1 percent or lower edges than that although this wont mean that i can be a winner now but atleast i have more chance than ever.
your shared strats to beat the house is okay , i have tried this and seen many gamblers try that but is that all a myth ? because theres that time that we are gonna loose after trying these strats .
House edge is an advantage to casino because they created the gambling activities and for them to earn they will going to make sure they will get the returns of their investment.
Meaning that casino are earning profits not by chance or luck. It was design for them ro earn and for you to play and making some fun with friends. Gambling should only consider as leisure and no way it could be a way to another source of income. Some gambler may feel lucky like hitting a jackpot but mostly gamblers will tend to lose. So make gambling a good leisure times.