It could be that their money is limited because it will be used for various other things so they use those methods. But I see when new gambling sites are promoted here, they can get new members in a short time because the level of enthusiasm of the members here in trying a new gambling site is very high.
The interest of new members depends on the offers offered by the casino because they are not necessarily active gamblers but just trying to test new casinos, I think it is not easy to convince new members because they have reliable gambling platforms before.