Even with small amounts of positive trust, I would doubt that a senior would get .4 BTC. There is one person selling a senior account for .23 BTC now.

If you have the time to put in sufficient effort to make quality posts, then now is probably a good time to buy a high ranking account as you would be able to ROI quickly in a pay per post campaign. You probably would have a hard time selling the account for what you paid for it in the future due to "account inflation" as many accounts are ranking up causing additional supply of higher level accounts.