Aged BHW accounts with no previous content, suddenly posting a lot in a short space

I've noticed more and more this week that people using aged BHW accounts with no/few previous posts and all of a sudden they are posting a lot in a short space (presumably to get to the PM count). Take this user for example:

https://www.blackhatworld.com/members/jbuwa.805838/

I assume someone is selling these accounts? I noticed a few threads on Bitcointalk where people are selling accounts.