moral issue: buying off private persons to sell with a markup as a (regular) business practice.
This is what retail business is all about
: you buy cheaper than you sell, otherwise you go bankrupt. I don't see the moral issue here.
To elaborate a bit on Ruffy's point:
People sell for a low price either they just want to get rid of it, are absolutely okay with the price or nobody will buy for a higher price in a given timeframe and a given market. If people really want to sell for a higher price, then they should wait, use multiple channels (different forums, ebay and willhaben instead of just one) and just not sell for a price that is not okay to them.
We are not talking about a person's day job to earn a living, but about hobby related stuff that they are selling. It's not that anybody's life depended on selling their Warhammer army, at least not in Austria.
On the other hand, if people are willing to buy hobby stuff for a ridiculous amount of money (and honestly, most of us here are, otherwise we were not users of this forum), so be it. A reseller adds a margin that people are willing to pay, not just for nothing but for financing their own business model, which includes running a retail channel for second hand goods open to people who would otherwise not get them (possibly because they just do not use channels like willhaben or ebay).
There are several things at the damage to criticize, but reselling second hand stuff isn't one of them.
---> Second hand goods belongs to the people, not resellers.
No, second hand goods belong to the people who buy them, they may do whatever they want with it, including reselling them at a higher price.
Dude, you should seriously rethink your understanding of a free market society.