They are wonderful sets Baden. I am not much a collector myself but I have had those sets in my hands many times and only my then gf (now wife) prevented me from buying them.
Once again like it has been said so many times these are the sets that brought Playmobil to life back in the day. It was a lot less focused with more "normal" people surrounding the central theme. The kids these days apparently don't appriciate such history/detail.
I don't know what you would get for them, but I wish you luck in your quest of getting your investments worth!