No can do. We need to be a registered not-for-profit, which we're not. So, ultimately as long as the 'buyer' is getting 'something' (even a tag under their name) and receive a tax invoice then they're not donations.
We pay two external spam services to check registrations. Check this link to get an indication of how much spam is kept out. This is def a priority though and we may need to bring on another service or have a one-week moderation period.