Account buying is a multi-million dollar business. Regardless of the grief the top level players give to those in game they believe have purchased an account, there’s nothing they can do to stop it. Some guilds will prevent people with purchased accounts from joining, but in reality, most of the high-end accounts already have the best gear you could get anyway. For every guild who would block a player from joining, there are ten who would take them just for the sheer advantage of having an end-game geared player.