This is how I feel about it. Quinn said he wants to go. And if he makes the Pacific squad, it'll be because we collectively put in time and effort to support him (it's not that hard, but still). And I think he'll feel that tangible support and passion coming from the fans. So whatever his current feeling towards Vancouver is, it can only improve, which could impact future contract negotiations. We probably only have one shot at this because next year, I think he'll be an automatic invite.
And when it comes to the scrims, perhaps the other all stars will experience what they've been missing in their lives all along - playing with a talent like Quinn. This could impact their future contract negotiations. Although I suppose there is the danger of this working in reverse.
Edit: While I agree it's possible he'll be more fatigued, I also think he could come out of the weekend with even more confidence and therefore even better play.
TL;DR: I think we should vote him in.