Thanks for the info. It's probably a good idea to take advantage of the market and low prices right now as I'm sure it's only a matter of time before more campaigns start popping up. I know of two or three potential ones that are looking at starting or re-starting but they could fall through.
You've to keep in mind that there are new Sr. and Hero ranks being awarded every two weeks. That means an abundance of sellers, and also a lowering in signature campaign rates (demand/supply).
You also need to take into consideration the fact that as time goes on accounts will get banned, people will forget their passwords, will attempt scams and receive negative trust, will simply lose interest in participating in the forum (and forget about their accounts). So there will be some level of reduction in the supply of senior accounts, this may or may not be enough to counter the fact that more full members are receiving promotions.
EDIT: It looks like there are ~8,760 full members, 4,840 senior members, 1,440 hero, 320 legendary members and ~506,000 member or lower rank (all rounded up to the nearest 40). I haven't previously checked these numbers however it appears that the vast majority of the supply of accounts is at the member level or lower.
You should also remember that not everyone is interested in participating in signature campaigns as some are here for a number of other reasons.
What? Pretty much every VIP account was compromised after the forum hack....or at least a sufficient number of them were compromised to make it a bad idea to continue to attempt to purchase one because it would simply be a waste of time to attempt to do so 
