I question the whole way Pinside is set up for fees. If you want to charge someone for listing an ad, then charge them. Why make it a donation? Is it to avoid taxes of some sort because it's a donation instead of a fee?
Also why have a donation for members. If you want to have a member fee, then just charge it.
I'm sure all of it has to do with avoiding taxation, which I'm all for since taxation is theft.
There is something shady on both ends here....