Yes, this is a great thing to do. I wish I could take advantage of it. Unfortunately, there's a multitude of reasons why I have to pass. I do hope you'll do it again next year.
That it flushes out the scammers is a big benefit. The flipping cuttings is one issue. If they donate $10 for cuttings and then only get a $5 bid on ebay, well, they got what they deserved. If, as it seems to have happened here, they see a variety spoken well of here, and then try to pass off a cutting of some other variety as that one... that's taking it to a much higher level. From aggressive greed to fraud.
Having a thread, like Harvey's, to identify suspected scammers is a good thing, and, we need to keep it up to date when things like this happen. Having everyone from the forum who does sell on ebay put a caution in their cutting description telling potential buyers to check the forum before they buy is something we need to encourage. Ebay isn't policing properly, and all of figdom suffers if entry level buyers get burned.
Thanks for what you're doing here. If it wasn't valuable that lowlife wouldn't be trying to copy it for profit. Each of you is showing off your own personal quality by the offer you're making. Those of who try to be informed do appreciate you.