All you can go by is the actual selling price. Sellers will usually answer you if you send them a PM asking how much they sold their game for. Everybody who has a Tron LE with the hopes of selling it someday will say what they can to pump up the price. Its normal in this hobby. Sometimes they will even get their friends to jump in and help with their comments. Thats normal too here.
Only a brazen few will talk about it being overpriced because they don't like being flamed by all those who currently own the game.
Price is simply dictated by supply and demand and where they two meet. Don't believe anything else. Right now the market is saturated by many new games by multiple manufacturers. Lots of supply = less demand. That is proven by the lower prices on games such as Tron LE, SM black, original MM and AC/DC BIB and LTBR for example. They along with a few others have taken a hit in the past year. It happens...the market changes regularly.