How do you figure that they can make up to .25 BTC each? I am not aware of any signature deals that pay that much, unless you are posting over the advertised maximum.
Bit x is paying 0.0008 per post for a full member at 300 posts a month is 0.24 I believe.
0.25btc per month seems impossible
if it was possible then why you will sell your account for just 0.1BTC
when you can give it to someone who can manage them into signature campaign for you
Not really.. The only reason I am selling is to pay off a loan at the moment otherwise I would be using them.