I agree with everyone, including Rudi.

This should be fun, and not a financial investment or burden for anyone.

Perhaps the contributions can take another form.

Many of us work for companies who's marketing honchos make up lots of freebies to give away for promotion.

I for one have mouse pads, coffee mugs etc. coming out of my ears. (Not to mention that our free food court stocks mustard pretzels.)

Perhaps these might be contributed?