I don't think there's enough of a market (yet) to determine what the price premium would be on a 3.0.
I agree with shrink...for $29K, you can get in line at Tesla, and get your 3.0 in 6 months...maybe. Or you could "buy mine today for $35K."
Is it worth a multi-thousand-dollar premium for getting something "right now" compared to getting in line with the rest of us peons? That's between the buyer and the seller.
But, it's certainly no unheard of. I mean, the freakin' PT Cruiser sold for up to $2K over list when it first came out, just because it was "cool, new, and hard-to-find".