IANAL, but I believe a ticket to attend an event is different from a CD or record. First Sale states that when you buy something like a book or CD, you have full right/control over what happens to it. But I believe that Louis has the right to revoke a ticket, making scalping virtually impossible.
I would like to know what a lawyer says about this, though.
If you ever read the 2pt font on the back of a ticket, you'll find that what you have bought is in fact a ticket license. The physical ticket itself is just for convenience, what you're paying for is the right to attend.
