Buying 2yr olds off Polytrack works

I am curious if anyone here buys 2yr olds at the sales. It seems at Keeneland the 2yr olds 1/4 and 1/8th of a mile times run over polytrack were ridiculously fast back in April. One went in 20 1/5 which is crazy. .

How can somebody buy a 2yr old off works off of the polytrack? A horse could work great over it and the dirt or work poorly over it and love the dirt.

Does Keeneland plan on continuing to work 2yr olds only on the polytrack or has anyone heard where they might have dirt works and poly works?