$50 bucks new?? I have around 100 of those new and sealed and cant sell them for 7 bucks each shipped. No one wants it because no one has heard of it because it is "rare." I own 1/10th of all produced.
I usually use ebay to determine what a CD is worth (because that's what people actually pay) but even then that can be deceiving.
On a good day I may get 30 for a cd but I could relist the same CD and get 10 the next week.
It's definitely a crap-shoot these days. That's why I usually list a CD with the price I want and let it move from there.