Fun read on this thread. I'm a happy Tron LE owner and it's not going anywhere.
I think the short of it is that we have a good idea what you paid for the game, so seeing you asking a ton more for it almost immediately after getting it is rubbing some folks the wrong way. The reality is that opening the box takes the value down on games. And the price you're asking isn't close to realistic. Tron LE peaked a year or two ago and they have settled at 9-11k depending on mods.
The big issue is that you're posting this on a pinball community forum. Everyone here knows the prices of games and everyone knows what you paid for it and knows the depreciation of an opened box. You might be better off posting it in other venues.