>>1000976990's toys don't really go for that much with some exceptions;for example Beast Wars prices blew up after years of Transformers fans thinking they never would. Generally if the series has A) a semi active fandom and B) no real replacement/ replacements thought of as better or the original toy has a niche appeal to the newer one.
So, for example, 90's star Wars doesn't hold much value because every character has better toys. Street Sharks hold value because they've never had an update, though.