Account selling are not encouraged, but not prohibited as far as I know.
18. Having multiple accounts and account sales are allowed, but account sales are discouraged.
Taken from Bitcointalk guidlines
If you really think they are doing something illegal with their topic (hacked account / scams), you are free to report to local staffs.
Either contact dbshck or Bitrent.
Otherwise, you are free to -neg them too as reputation are not moderated.
giving them -neg rep with account with -neg rep ?
rofl
edit: atleast one or two dt 1 or 2 mark them , and also hacked account ? who knows