Background
After reading through several policies for Stack Exchange, I could not find anything that explicitly forbids or bans a user from writing a question or answer on behalf of someone else in exchange for money. That is, I could not find anything that states someone who is paid to log in as another user and write a specific answer, or question for them. However, given that I have seen policies against Real World Training in websites such as Runescape and World of Warcraft, I was curious if something similar existed for Stack Exchange and its sister sites.
Question
Would payment in exchange for writing another user's question or answer potentially violate the legal policies of a Stack Exchange?