^You don’t normally get treated different because of the marker, but you usually get a marker because you’re planning on playing with a ton of cash that you’d rather not carry around. Playing with a ton of cash will result in perks.
I have a friend who doesn’t have a ton of money, but has like $80K in savings. She wires something like $50K to the casino to act like she is a low end roller and gets free meals, room, everything. The catch is that they have an escort (like person who meets with them to try to make them spend it) and she has to push them off the whole time and she usually ends up up or down $5K for the week, which she subscribes to worth it for free lodging and stuff. But, you have to have the ability not to get hammered and blow $10K in an hour or something (which the escort would prefer you do really).