Idea for pricing the Surface Pro or other new devices

How would it work if, instead of pricing the Surface Pro at $899. Microsoft priced it either higher or lower and then varied it as sales came in.

e.g. First day it is released at $500

Sales spike, they increase price to $550 etc..

or they go in reverse:

e.g. First day they release at $1500

No sales, the decrease to $1450 etc...

I understand you'd probably increase buyer remorse if you came down in price, so maybe going up in price makes more sense.

You might lose some initial margin from early adopters but you'd be able to define the market better.