I have seen prices like this in the forum:
Jr. Member : 0.001
Full Member : 0.05 BTC
Hero Member 0.1-0.3 BTC
Legendary Member etc etc. 0.3 - 1.2
You forgot about Seniors - I've seen them go for 0.3 Heroes are usually more expensive.
A hero for 0.1 would have to be with negative trust to go for 0.1 because an account like this can earn you more in a week.
currently the price is decent but soon it will fall like hell because alot of new account are coming is markeet with real cheap price which will give newbies to earn some bitcoins
You really can't go much lower than the prices given by virtualx because even low paying campaigns will give 0.05 to a full and 0.1 to a Sr every month.