The fine print is what will determine how each is executed. For example, some bonuses will be awarded but they will be paid in monthly increments. This means that dormant gamers will not really feel the gist of it. Those people who also plan to register for a site, get the deposit and play a few turns so that they try to cheat the system that they are active accounts will also loose out. Many guys try to get the deposit on the first shot and then run off with more than they deposited and that is an idea that the casino owners are well aware of and will not be too impotent to let it happen.
Websites usually specify whether the bonuses are percentage bonuses or if they are match bonuses. They will also rate from 50% to 500%. Match bonuses are the bonuses which are exactly 100% of the deposit. That is why they are called Match bonuses since they match the deposit. They are even money type of bonuses and therefore, they keep multiplying your account by two. For example, every time someone deposits a new sum, the casino will just assess the current balance and double it if they are offering 100%.
Rarely will people remain with the same balance that they started playing with the first day they signed up. People will keep reloading and topping up every now and then. The need to top up will come when someone feels that he wants to challenge a higher profile game or opponent. This calls for putting more money for the higher stakes. Top ups are also done when the account of the person is running low and he needs to keep playing. By this time he is probably more experienced and would not mind having a little more money deposited. For professional gamblers, deposits are as good as investments to them. The only difference is that people have different abilities, with some willing to deposit a lot at once while others will prefer to have the deposits done, little by little.