It's not illegal as long as he is not claiming the services he provided as a donation to receive a credit on his tax return. If he is claiming the donation, then he has to deduct the value of the membership he receives. He's giving something of value and getting something of value in exchange, he can only claim a donation on the difference if his services are more valuable.
Since the orginization can't control what the "donor" does or does not claim, the organization wouldn't have liability for the improper claim. To cover you even more, you could send a letter indicating the value of the benefit conferred on the "donor" and asking for an itemized statement of the benefits being provided to you.
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