I made around 50-100 /month with 2,300 files, of which 5-10 was for subscriptions. I won't miss that little cash, so I just opted out of subscription licenses as well as of extended, since they will sell "Social Media" licenses that include the right to share the images across fb, g+, twitter et al.
Bad moves from PM methinks.
I'll upload the dozen of vectors I have, though.