I don't. And I spend a lot of money on tickets, don't much care what they cost, and let them go unused more than I should. But, the "unused" are $20, 30, 40 tickets.
For instance, I very much want to go to QOTSA, but have a major event that might interfere. In fact, that major event is why I want to get a balcony seat -- may get there late, and I need to do my best to stay rested and in good form for the weekend.
This poses two concerns.
(1) good chance I may not make the show, so would either sell my super special ticket (I always sell for face, and normally to fellow boardies) or let a friend go in my stead;
(2) I didn't get a super special ticket, so have been watching for one. If one goes on Stubhub, am I about to buy a ticket that I can't actually use (and I can pretty much assure you, with the first dozen shows, purchasers were NOT aware of)?