As a wise man from cj.irg once said, when you get a new acrylic, first thing to do is throw it at the ground and then you wont worry about scratching it anymore.
I was in a park with a few heads once and we were juggling away. A nice shiny unscathed 100mm acrylic in my hands. My girlfrien said dont stand so close to the pavement. I had'nt even finished the sentence "ah no, i'll be alright" and it went flying.
It's strange, no matter how many pillows, or a grassy field or whatever, them seem to be able to home in on the thing that'll do them most damage and head straight for it

DSS- at least now you'll be able to practice without worrying about it. Cool poi vid BTW