I think it's depend on your bankroll, if you have big bankroll you can go gambling for long term and you can earn unlimited money. For me, i can earn from gambling up to 5-10bitcoins.
I`m like most people who dont have that kind of btc bankroll.
So I`ll start by saying I dont start with anything, because I know I wont earn anything lol.
The only form of gambling I did take was 0.1 btc at primedice and made 0.0001 or something minimal at 90%.