I think this is a great thread started by Jesse, and have thoroughly enjoyed reading all of the comments.
Having been a re-seller of old, rare and/or out of production pipe tobacco for more than 20-years, I have received a lot of comments from my buyers as to why they are purchasing such and such a tin. I'm not sure which responses were most prevelant, but here are comments I get when someone pulls the trigger on $100+ tins that I sell to them -
* I've heard about this great old blend for years and have always wanted to try it.
* My father/grandfather smoked this one all the time and I'm buying this tin for nostalgia's sake.
* This is one of the finest tobaccos that I have ever smoked and now that it is out of production I hoard as many tins as I can find for future enjoyment.
* I'm actually buying this tin as a gift for: a friend/family member/my pipe club.
* I collect rare pipe tobacco and this tin will be a great addition to my stash.
* I see this blend sell on your website all the time for huge prices. I figure it must be good!
* I loved the tin art on that one and just had to have it.
And finally, I will close with one of the most humorous comments that I ever received - "Hey dude, you don't fool me. You are running a fake website to build your reputation. You really don't have those tins or sell them at those ridiculous prices. Nobody would be stupid enough to pay $400 for a 50g tin of pipe tobacco. Someone should report you for fraud!"