I'm late to the party, but I'm in for $20. PM me the Paypal info.
Your text works pretty well. If they bench Matt, shorten the banner and fly "We deserve Better - Fire Pioli". If Clark makes it clear Pioli is staying, fly "we deserve better" the rest of the games.
Someone needs to prepare to be the well spoken face of this and emphasize it is a grass roots group effort. It's too easy for Clark & Pioli to slide out of it if people think it's one guy.