I am surprised to know members here sell their accounts. I assume that means they're not flush with money as everybody says? 
The whole account selling thing is a problem but as long as the forum is going to allow it I think everyone needs to be warned not to trust accounts just because of "their status".
If you ever see my account offering some *investment* then know that it is not me (in my entire post history I have never done that)!
Solid advice. Though I doubt that many (if any) Legendary level accounts have been sold, I am sure many JR-SR and even some hero level accounts have so checking the post history is the best way to be safe.