Why should i give you a Google wave invite~!!~?

just received my invite to Google wave ,with 8 invites for me to pass on ,7 will go to my group members~but why should i give you the 8th?will send the 8th invite to the person i choose as best answer.
you will need to have a contact E Mail address in your profile ~unless you do i have no way of sending you one ,
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