i think you should hold on the accounts and wait for other advertising campaign start.
using it all for sig campaigns is not effective i think, you will only earn few bucks on it because it will be hard to make maximum post counts if you have multiple accounts
A single person however does not need to buy them all at once. In order to make about 0.25 in month you only need to post 10 times a day with one of these accounts.
How much for one full member? i may be interested, looking to help my friend earn some money. That being said, i strongly recommend Bit-x. they are paying 0.001 BTC per post.
The OP selling his account each 0.1
BTC per full member account, yeah Bit-x are paying 0.001
BTC per post.
The bigger Signature campaign who paying with 0.001
BTC per post