I understand the reason why they are selling the Bitcointalk account, but the Reddit account? I don't get how it is profitable for someone to buy the Reddit account since I don't see any means to make money in Reddit, I don't frequent in that message board so I don't know if there is one.
Because in order to post on some subreddits, your account has to have certain amount of post karma, and in some cases they even ask you that your account is aged etc. So if you want to advertise your business/scam in some of them, of course it will look much better if you are using seasoned account that has been around for quite some time.
But personally, those advertising crap on reddit and even buying an account to do so are wasting their time and money as reddit is very strict when it comes to that and delete the content regularly.