I don't see anything illegal about it, but it could be a nuisance to cash in winners(especially ones that require tax form). I have often thought about mailing tickets to friends across the state. i think it would be cool to do it in the same state and have a ticket swap, but at the same time if I possessed a $1 Million dollar winner and then mailed it elsewhere as part of a ticket swap, I would be ticked...
To take it one step futher I wondered about the legality of a clerk reselling a pack from another store. My regular store goes to Norristown alot. He has a friend there who gets soda cheaper, so he buys from him. I always wondered if he would be "allowed" to buy a book down there and sell it in his store as a full book or ticket by ticket. As a friend I thought to ask him a few times if he could get me one from down there, so i am sure thats legal, but I would doubt the reselling of a book he purchased elsewhere would be kosher. Granted it wouldnt be worth his time to resell the book cause he would lose the 5% profit the original owner got for selling it, so I would figure he would only do it for regulars or friends who plan to buy the whole book.