Maybe i am different but i think 300 hurts less then 260 or whatever. I play 280 locally and 300 elsewhere, i find the 300 jump fine.
Below 280 i think it stings a little more as more paint bounces. At a higher FPS paint breaks easier (especially over a little bit distance). The reason "customer sites" have a lower FPS is not so much safety but more the fact balls bounce over a greater distance meaning the player can play on for longer (shoot more paint).
If a ball hits you in the eye @ 260 it will replace the eye ball the same as it would @ 300.
I agree with the reballs being shot at 260 but they dont break and will sting no matter how much you up it lol
Edit:- I am nearly sure there used to be a rule that a maker cannot be used under x FPS for this reason? Its not in any of the new rules but remember reading it in 1 set of rules?