Guys, we are a sales force.
In the brick and mortar world, sales forces are comped, and top sales people are comped more.
The more you sell, the more the company makes, the more they comp you to spur you on to sell more. Then they will make even more and comp you even more so you try like heck to sell even more.
And so on.
This happens to a degree here with contests that reward you for bettering yourself and making more money for the casinos.