Vegas is one of those cities where most inhabitants moved from somewhere else and still cheer for their old teams, kind of like Miami.
I bet most games there, fans of the visiting team would outnumber the home fans.
One of the reasons vegas is targeting the Raiders is because the team has fans that travel to see them. So if the Raiders move to Vegas, yes there will be many fans of the opposing team flying in for a Vegas weekend, but the raiders will have just as many non-local fans flying into vegas for the weekend, too.
Only Dallas and Green Bay have tourist fans just like the Raiders, but none of these two teams are planning to ever leave their respective towns.
The Raiders in vegas make a lot of sense.
You’re close to the real problem- There’s no such thing as a “home team” anymore. My (then) Rams always had Rosie, Deacon, and Merlin. Now, I don’t even know where the Rams are, let alone, who plays for them.