A while back I bought a couple of event tickets online through Ticketmaster. As I usually do, I created a unique e-mail address for the transaction, so I could see if the website operators (Ticketmaster) were distributing my address to others for marketing purposes. (I create a unique address, then set it to forward to one of my "real" addresses. By looking at the To: field, I can tell where the address originated.) Since then, I've received a flurry of spam messages, all addressed to my "special" Ticketmaster address. The ONLY place I have used that address has been in a single transaction with Ticketmaster, so there is no doubt at all where the spammers got my address.
I've been using this spam tracking method for probably 10 years or more, and this is the only real egregious case of name-selling I've seen in all those years. I was going to send them a message to let them know I'll be reporting them to the FCC and FTC, but their website has no contact information as far as I can tell. Why am I not surprised?