I don't think Power tour has limited spots like Drag Week does. Even Drag Week is probably less of a thing than we're making it out to be. They "sell" the initial 400 spots, then create a wait list using time stamped emails. If you're on the wait list and still don't get a spot they say to just show up as they have never yet turned anyone away that showed up on day one. Power tour though...thousands of cars and everyone and everything welcome.
Speaking for myself I didn't want the stress of being on a wait list for the next 6 months. i'm not the most anxious person in the world, but that sort of thing could give me an ulcer. lol