My daughter just did one for her school, and as a parent it is annoying, but it can't hurt to ask, and I don't think twice when someone declines. Not a big deal to me at all. Just say, " aw I wish I could but we just don't have the funds right now" no biggie, schools have to get funds somehow.
Melanie-Mommy to my HERO Madeline Parker
1/15/07-8/23/13 Fight For Maddie
our "Bumble Bean" Benjamin Patrick
1/19/13 and our "Little Bit" Eliotte Claire