you should also be aware that Marktplaats is subject to manipulation - a bid may not be genuine but reflect the seller's ideal - a decoy bid. It is not likely that anyone would be willing to fork out hundreds of euros for a kitschy knicknack which has been in production for over 50 years....
Shrug, basic economics. Supply has to be checked against demand. Demand apparently is high enough even for the large supply.
I checked Botterweg auctions 2010: the last nude figurine of Bloch to go under the hammer in 2010 was valued 750-1000 euro. Minimum bid was 550, it fetched 750. Seems this one is very much in demand. Even if a professional auction house like Botterweg would manipulate the bidding proces (which I'm not suggesting in any way), apparently there are still buyers who will offer that sort of money plus 20+% auction expenses in the end. The kitschy knickknack is a genuinely expensive knickknack

The satined deer figurine was valued at 20-40 and went for 56. That's lower than most bids I see on marktplaats for it, where it usually goes over 100. The car mascots are the most expensive, they fetch over 1000 at Botterweg.
I'm not saying of course that I would pay that for any of them.
Astrid