Wait until you got a legendary rank and earning .1btc is possible for you.
all it took time, yeah if you have a high rank that I think the rate will be high for a sign campaign and you can make services such as escrow and such it will be an additional income. because the legendary rank usually trusted
You know 0.1 is equal near about $100. And as you said when our rank will be changed into legendary, then we could earn 0.1 btc from signature campaign. Actually i have not seen anyone who earn 0.1 per week but it is possible within 2 or 3 weeks.