Why do casino stocks suck?

L'auteur se demande pourquoi les actions des casinos sont peu performantes malgré les profits importants de ces entreprises.

Let me preface this by saying, I am a boglehead. I am 90% VTSAX, 10% VBTLX. I'm only asking this question in an attempt to better understand things. If casinos are disgustingly profitable companies, why does owning their stock suck? In other words, if those insane profits do not go to shareholders, who gets them? The board? EDIT: I suppose I wasn't clear enough in my initial post. I'm referring to MGM, Caesars, Sands corp, etc. Not online sportsbooks, although I guess this question would apply to them as well. And thank you all for not flaming me. I'm not advocating buying said stocks, I'm just trying to understand better how things work from a curiosity standpoint.