It's mainly expense. I would love to have a '57 reissue Strat (and I would actually prefer a three-way pickup switch - I don't dig those 'in-between' tones too much), but they cost somewhere in the neighborhood of $1000-up.

And my standard Strat is playing a treat right now. And it cost $300 or thereabouts.

And don't worry. I'm sure a '57 reissue would play like butter, as well.