You should be in politics. I asked you a simple question and your answer left me none the wiser!! Haha. My RTGG cost me £20 at 3". He's 17" now and, like yours, he's about 4 years old. If you scale it up then god knows what they're worth. But then again they're only worth what someone's willing to pay I suppose.I paid way too much (as far as market value) and it was half their original asking price.
They have a history of asking mega money for big fish.
I was in there and looked at him and decided I owed it to him as the value of him in my tank was higher than the asking price meant to me lmao.