Good Question asked
Dear Affiliates first you have to do daily work .At least you have to give one to two hours daily. This is called Time investment.
Second investment is to purchase few items from tripleclicks.com to maintain 1500 VP each months.
Third investment is to be a member of IAHBE,WAVE3,S-BILDER,ETC.
Fourth investment is to be advertise on social site,blogs,on your website,Etc.