I just recently realized the global content subscription thing.  Hadn't checked my ME account in a while since it never sells.  Turns out I sold 17 videos during the last 3 months.  They wont show earnings until the quarter is over because the earnings are based on what the person bought with their credits.  But after searching it appears that if they used all of their credits on your content you will likely get 8-12$.  But 3-6$ per sale is what is expected.

This is a low amount but slightly madeup by volume.  I have about 600 videos on ME and sold a total of 3 in 3 years, each for about 20-25$.  I sold 17 in the 3 months since the global content system was implemented.  If I average 5$ I will have made more in those 3 months than the entire 3 years prior.  So only time will tell if its worth uploading anything at all and if you are willing to accept selling videos for under 15$ a pop.