Are you using the student method or you have another method for this ?
And can this be used on an account which has had a Prime membership in the past from the student email ?
Yes, you can add it to any Amazon account you want but it won't extend what you already have only replace it. He's just adding you on HIS account (or someone's account he has) as a "family member." When you have Prime you can add 4 family members at no charge. All they get is the free 2 day shipping and no other prime features. If he sells 4 family members at $25 each his $99 PRIME with all the features is free.
Nothing wrong with doing that as long as you know the limitations. You just need to make sure the seller doesn't disappear, drop you off his PRIME then go and resell it again elsewhere but from his "trust" he seems quite safe.
That is all correct.. good point about selling 4 making it free for me, I'm going to lower my price to 0.04
BTCand yeah I could drop someone off and sell the slot to someone else but wouldn't, I'm not trying to cash in off the thing..