The comp tickets you get from guest relations for issues are nonrefundable and not upgradable. They have 0 dollar value. We got 4 one day tickets to make up for an issue and we quickly discovered since we never go for just 1 or 2 days it was cheaper to give one person all 4 tickets and buy 3 4 days instead of 4 3 days or whatever combo we ended up doing. That's why they give them away because it costs them pennies and you either have to pay for more tickets or buy stuff on your next visit.
Interesting. So that's part of their plan, after you buy the 4 day ticket you need, you aren't saving that much with that one free day ticket.