Actually i was in my page 5 some months back what i found the admin deleting genuine comments also,one day i viisted around 50 profiles and gave some comments and my balance increased but next day i found most of my comments deleted and balance also reduced ,it was not happened with me alone but 2 of my friends also faced,admin has right to delete spam comments or repeated comments on single day but no right to delete genuine comments,another thing in blogs they will approve then publish.
Finally i do have some doubts on the site's running because site admin openly telling some members to click on their ads,it is unethical and so many members active there but only one or two are being eligible to get payment each month ,this is suspicious.