Selling accounts is really discouraged in the forum. But if the people are so stupid to give their money to an untrusted newbie... well, this is called Karma. Probably the sold account will end with red trust and the money wasted. Probably this one doesn`t even have an account to sell. Whatever it is, to be involved in an account transaction like this one means to be kind of stupid.
Like it or not is business, those bounty programs that pays you monthly in exchange of renting your signature / avatar / personal text space is crappy marketing and should also be discouraged.
The people who are buying those high ranked accounts are doing it for advertisement / promotional purposes, they don't give a sh*t about karma, community, quality of posts.
If someone is involved in that kind of transaction is because they are here to make money, might be considered stupid for others but they're making a living out of it because the people who govern this forum by making the rules allows advertisement on first place.