A hearty welcome to All Scale Trek.com!! We are fairly relaxed
here, so chances of incurring 'Mod/Admin wrath' are nominal.
AST evolved fairly quickly into a model kit forum, so expect limited replies. We're somewhat in a state of 'transition'.
That said, I would love for you to stick around though, as we have a good group of all-round fans.
Feel free to replicate your post in our 'General Trek', 'Classifieds', and (if you feel like saying hi to the masses) the 'Introductions' sections. Like many forums out there, not everyone will catch your threads in one section, so multi-posting (allowed here) is one way to maximize results.
I only know about Playmates toys, so I couldn't offer you any specific information relevant to the items in questions.
May I suggest the following (while waiting for replies):
1) Sign up and post at https://www.TrekToy.com/forum
It says it all in the name really. Whereas they cater to all manufacturers of Trek toys, it's the Diamond Select and Art Asylum that appear to get the most attention.
2) Do the same at https://www.StarShipModeler.net
(the forum domain for their .com store). They have a Facebook group too.
They have been around for a good 12-15 years. Although, like AST, it is seems to be mainly model chat, you'll find a lot of Trek collectors frequent the forums as well.
I would recommend posting in the 'General Sci-Fi Modeling', 'The Marketplace' and 'Star Trek Modeling' sections.
AST, TT and SSM could very well answer your question and provide you with additional sites that specialize in toy collectibles.
3) Have a good look at what these items are going for today, at places such as eBay. I have found over the years that just because something is rare, and/or worthy of the estimated price, collecting is like fashion and will only sell well if it's the current trend.
Oh, and you may wish to Google "action figure forums" and see if any of the older ones are still around. Facebook Groups, if you're pro-FB.
I'm sorry that I couldn't be of more help. Hopefully, there is something of worth in this blurb of mine.