Klumpen0815: Do you remember my art competitions?
Everybody said that it's a cool idea and nearly nobody participated.
monkeydelarge: Probably because most people can only create stick figure style art. Artists are truly very skilled or gifted people.
I can say from personal experience that this art thing is more a matter of dedication and hard work, not so much of any miraculous gifts. ;)
But I understand what you guys are saying -- of course an art contest, in example, would limit the number of potential participants. Hence why I mentioned that the creators of such giveaway/contests just need to be more creative, and come up with all sorts of challenges and themes, so everyone can participate even if they don't have any amazing skills as artist, writer, musician etc. The main idea here is mostly that participants should invest some time and effort, and show they are really interested in the games on offer, and not joining solely because " Hey, it's free stuff"!".
Of course it also depends on the motivation to create a giveaway. If someone just wants to get rid of some codes they don't need, they can do it in any old way, and don't need to do anything fancy about it. ( But then I figure it also doesn't matter much who's going to receive them, including "scammers". )
On the other hand, I know some people like to create giveaways to celebrate special events in their own life, like a promotion at their job, and they buy ( sometimes expensive ) games specifically for those occasions. In those cases, I think it would solve various problems, and also make the experience more fun for everyone, if they don't simply drop the codes in a thread. Of course it's their money and their choice; just saying that putting a bit more thought into these giveaways, especially when the games on offer are valuable/on high demand, would potentially avoid some of the negative side effects of offering freebies on the web.