#3 Name value
Georges St-Pierre sells tickets.
That name alone sells tickets. Anything about the man himself sells tickets and to Vince McMahon, that's the most important thing of all. The crossover appeal of a GSP run in the company would be huge, and nobody can deny the impact he'd have. Hell, you could base an entire Canada-based card around the guy.
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People like John Cena and The Rock hold a lot of value because they've built themselves up to the point where they're an actual brand now. Everything they say and do resonates with so many people and they can never be taken down from the pedestal, which is pretty much the position St-Pierre is in, even after a few years away from MMA. What a guy.
Onto a factor that some may not really believe in.