Quoted from beelzeboob:Absolutely correct. That's the exception to the rule. If it's the same theme, then yes...it will devalue the previous game. Same thing happened with Jurassic Park as well.
Data East Star Wars prices skyrocketed after Stern Star Wars came out, DE Jurassic Park also popped up in price but not as large a margin.
DE Star Trek seems to have not moved around very much though, gone up a bit with normal pinflation.