Could you provide a picture of the one that you're looking at, please? Some models cost more than others, but at the same time some people will try to sell things for more than they're worth because they mistakenly believe that "old = rare" and that toys are investments. Not only that, but some models are more expensive now because they were unpopular during their time - sometimes due to not being as good as earlier iterations.
Moreover, some online articles about toy-collecting (often ones bearing titles along the lines of "Your Vintage XYZ Could Be Worth A Fortune Today!", and similar) are deliberately misleading due to actually being associated with pump-and-dump schemes such as those that affected collectible coins in the 1980s, and which are affecting vintage video games right now. More information can be found in this video;
It's about an hour long, but it's very informative for genuine enthusiasts who want to avoid getting ripped off and seeing their hobby gobbled up by disinterested parties who only seek to commoditise items in order to attempt to profit later. Be wary!