OK, but think a little bigger my friend. You don't think the Casinos will have massive blocks of tickets to hand out as comps? At best 60 -70% of the tickets, and probably much less, will be available to purchase by the fans. All the games will be "sell outs" but most will only have around 80% of the stands full (I think many of the comp tickets will not go to Raiders or opposing teams fans and won't be utilized by those that get the tix). Then out of those people that are there, what % will be Raiders fans? It'll be much closer to a Super Bowl type experience than a typical NFL game experience and feel.
The home field advantage will be lost. I guarantee it. I also guarantee at least 2 players per year f up their lives and ability to help the team by being young, rich single (or married) and living in Vegas and doing what we all do in Vegas. Problem is, for elite athletes in the NFL, what happens in Vegas will not stay in Vegas. Good luck with that.
All that said, as a season ticket holder for 22 years, I prefer Vegas to LA or San Antonio. I do worry about not having a true home field advantage and the problems our players will get into though.