nobody would want to walk away from a casino after having a good experience there.
Sometimes people get bored, and want to try new things elsewhere. There are various reasons why people can decide to walk away from a platform despite them having a good experience with the casino. It could be they got a better officer elsewhere and decide to leave. A casino can suddenly stop giving their customers incentives, thinking they have secured them as loyal customers for life. While another casino out there is constantly giving their loyal customers incentives as loyalty rewards. The people in the other casino that is not giving any rewards will gradually lose their customers as they will keep walking away.
I understand the point you're trying to make, but I have never once gotten bored with a particular casino and felt the need to tryout new ones. But, that's doesn't change the fact that people can walk away from a casino despite having a good experience with it.
If you see trying out new casinos whenever they come to forum, it is because I want to see how they operate and determine wether they are reliable, not because I'm board with the ones I'm already using.
Promotional offers can also make people abandon a casino despite having a good experience with it. People who do this are usually called bonus hunters, because they are always looking for casinos with attractive welcome bonuses and promotional offers.