one reason is that people buying cheap sets and selling parts for much profit. iam pretty sure thats the main issue with geobra. they trying to stop the ebay selling due very high prices etc. i think thats a company image propblem. i think aswell, when they start to sell body parts at the DS to fair prices ( legs 25 cents, arms 10 cents etc) ebay would die out and they won, but aslong this not happend, they will waste time and money on those crap which actually is damaging their image badly...
It's the customers who help set the high proces by paying them or bidding them up and as these are independent sellers, then it can hardly affect Geobra's image. I think, too, that if Geobra started selling parts of klickies through DS they would soon find that an expensive mistake as they are toy makers and not toy spare part sellers. In addition, buying parts of things is always expensive, as with cars.