A rifle is only worth what someone is willing to pay for it, hence why I try not to pay much attention to TV shows like pawnaton as they do not seem to reflect what the collector market is willing to pay.
You don't see T-Gewehrs on the market as much as you see an SKS so I imagine a good condition one, in original trim, would go for a pretty penny but not as outlandish as say a Gewehr 43 but that is my two cents worth.