I have seen many accounts being sold here and unless no one took necessary actions, I don't think that it is illegal here...
So, I am not encouraging you to do this, but if you are here just for bitcoins, then buy a potential account and get it into signature campaign...
Even if you become a Hero Member, I think that maximum time it will take you to reach your goal of 1 BTC will be 10 months and that only if you save your coins until you reach there...
I don't think so.
Of course, users can do this, sell their accounts but almost all signature campaign managers, if they discover it, will remove such member from the campaign.
It's not to difficult to find out if someone bought account really.
It's better to stay fair and honest and slowly build your forum rank.
It will not help you in short term but in the long term you will have more benefits.