I'm not sure what you're saying. Anytime a record label or publishing company or anyone other than a creator has a right to something, it is always because the creator transferred that right to them, usually in exchange for money. If an artist cannot transfer their copyright, what value does it really have?
Sure, there are rules and laws in place which enable people to trade copyrights. The point I am making is, is it ethically even possible to transfer a copyright in the first place? It seems as if you keep clinging to the business side of things here, and ignoring the ethical discussion.
I can't see how copyright was ever intended to be transfered in the first place; it was "invented" to protect an artists' assets in order to prevent potential loss of income from copycats and such. I find it very strange that you seem to be okay with buying someone else's ideas. I mean, you can license someone else's work, or adopt it (for a fee), or whatever, but there's just no way that you could ever claim intellectual ownership of the copyright to something that you never created yourself.