Can you remove the glass from the screens of the glossy MBPs? From what I gather, it's a standard glossy screen a la the white macbook under there, which might be preferable in some cases. Just wondering 
If you want to void your warranty, sure. However, it's not glossy underneath. That's what an anti-glare screen is: the glossy model with the glass removed.
If this is true I am shocked that Apple would charge an extra $50 to NOT put the glass there.
There are literally dozens of threads in this forum discussing that very fact. Try MRoogle.
When you say it'll void my warranty, what do you mean (I know what voiding warranty is, I'm just wondering why)? I mean, is it a feat to remove it, or is it just a matter of sliding some glass out or something?
Apple's warranty states:
"This warranty does not apply...if the product has been modified without the written permission of Apple..."