With regards to copies, it is the old piracy argument.
I see a lot of back and forth with regards to music/films/games bittorrent on
http://torrentfreak.com/Personally, i think it is morally wrong, but unquestionably unlawful.
On one side people talk about piracy boosting sales and helping to get indys going, screwing misleading fatcat producers or unnecessary middlemen, the right to properly own a product you buy and do with it what you want, outdated business models that need to innovate and create new monetisation systems (like for example free 2 play games, "pay what you feel it is worth" schemes and very affordable streaming/cloud services).
And the other side talk about how artists/creators should be paid for their work not have it stolen or copied, the issue of owning intellectual property, how industries are able to survive and keep their identity due to copyright law, macro economics and economies of scale (like how we collectively pay for a £100 million movie production) and how piracy effects them to make us all eventually pay anyway, and how some people are just spongers or parasites and just want a free lunch.
The issue of the 2nd hand market is a completely different beast however. Obviously its bad that the original creator does not get a taste in a second hand sale and it really sucks that whole companies are dedicated to this kind of industry (in my opinion at least). But should you be able to sell on products that you have paid for? Yeah mabye. Its a clear cut yes with a unique item like a piece of furniture or something but with a copy of something that was produced at much greater cost that you originally bought your copy for? I dont know.
But at the end of the day when I specifically think about FvsF material and less generally, I dont think you should trade or pirate it AT ALL. The industry is so small that I dont think it can take too much of a hit and you can really mess with some of the tiny struggling businesses.
But the upside of this fact is that you can make a huge statement with your purchase. Buy what you like and support it, or choose not to buy it and let that company die off.