Like English is most preferable and therfore can have some extra multiplier...
Also, posting off topic and newbies and other local boards can also have a multiplier...
I think this will give more accurate results here.
Also I don't know but is there a way we can get a current market price by comparing what the accounts are selling right now... This might be a bit difficult..
Well these are my suggestions ... Really good survice by the way.
edit: I may be able to have it tell you what languages the account has posted in, but that won't effect the price of the account.