Its nice to know there is still honesty and integrity about.
As far as what to do, I'd just be honest with them about how you feel and try to work something out.
If they insist, go with Mace's suggestion or suggest they give you only half what they want and donate the other half to a worthy cause.
Or ask if you can sponsor the local clubs with them money instead.
They are obviously trying to be good people as are you, so put the money to good use and perhaps we can have a thread on here about how to help our community.
And in case I forgot....................
ASK THEM TO GIVE BLOOD AS WELL AS MONEY...............
Blood is so easy to give, free to give, and saves so many lives.
Perhaps there's another my swag thread.
"I donated blood today - thread"
I love it when things are good and people work together as it should be.