To me, the Trading Card system is mostly just a way for me to get some change on my steam wall. Every now and then there is one I absolutely like and I will keep, but otherwise I won't keep them. There just isn't any point for me - I'm not interested in "improving" my profile page. I just want to play, and that change might proof (and already did) enough to buy something every now and then.
Which is great. Those who do want to craft them can buy them from me. Win-win for everybody (I just wish they paid more).