I don't see why they would worry about it.
The price was 80.00 on eBay at first - I cuold not give my invites away to my friends at that time. Now the invites are going for about a buck each - and that is barely enough to cover listing fees.

dmv wrote:
] ] According to Google's new policy, altered Monday, the Web
] ] search company prohibits Gmail subscribers from selling,
] ] trading or transferring the free e-mail accounts "for any
] ] unauthorized commercial purpose." It also bars people
] ] from setting up multiple accounts in violation of the
] ] policy.
]
]
] I think we are still good in having done out invite giveaway
] for our non-commercial radio station. I guess we can ask in
] our upcoming interview with a gmail representative.
]
] Of course people are gmail-username squatting. Huh. Suprised
] that wasn't obvious, considering the landrush mania to get a
] username; artificial scarcity brings out the worse in people.
] In that light, forums like eBay are both powerful mechanisms
] and inherent in the medium.

RE: Google bans Gmail swaps and sales | CNET News.com