The only ones I have familiarity with are the PTDs. As you mention, none sold on ebay recently and in Frollo's case, isn't even listed. But I don't think that is a sign of them being rare so much as not overly popular. I see some folks are trying to get $65+ for Elinor, but considering other Brave pins have sold recently for a third of that, I don't see that happening. Similarly, Carpenter is being offered for $35 OBO with no takers. So likely real value is less than $30. I think that it's the same situation in Frollo's case. So maybe ask around $30 each but be willing/ready to take less? Unless you want to sell all three to me in which case I am sure they are worth about $20 each.
On the Love is an Adventure chaser, I do recall that one being one of the hardest to get so probably worth a fair amount. In that one's case, I do think the lack of an ebay presence is due to scarcity.
I'm sorry to hear you are selling off your traders. I hope that doesn't mean you are getting out of pins completely.
Good luck on your sale! Will you be posting it here?