Your underestimation is funny, one thing is raider nation is every where. They could of put a stadium in Cameroon and they would fill it.
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I think the NFL will do fine in vegas, im just wondering if in a town full of transplants (like vegas is) will the raiders be filling the stadium up with raider fans...or will it be more like the chargers current situation. They better be putting out a better product than the last almost 20 years of garbage.