But in my eyes, best think about the gambling sites, should give the trust to their gamblers.
There are already so many gambling sites that making a new one is of no benefit, unless you can attract the customers by giving them incentives like 100% free deposit bonus on every deposits and schemes like these.
Firstly making a gambling site requires good fiance and then as you mentioned give 100 percent bouns is not a easy thing to do if someone is low on the budget.