How much would a Tomy Oliver ACTUALLY be worth?

It's weird because what one item is worth to one person can be worth something completely different to another person. See I think Oliver is only worth max $50 yet people will pay $150-$200 for a complete set with coaches (which I think is crazy) but I think a BNIB sealed version would be worth like $400-$500, all depending on the type of box of course, with me thinking the list in terms of value would be Blue Tomica World, Yellow Tomica World, Motor Road and Rail then the Plarail versions after