You build your trait score simply by being active on the site and completing surveys. The surveys from Paid Viewpoints are some of the shortest surveys you’ll find. They even advertise that a survey will take only 2 – 3 minutes. In whatever case, even if a survey takes more than twice the advertised time, it will still be the shortest out there. On the average, they ask about 10 questions. To make things easy for you, they set a character limit for each survey answer (between 90 – 120).
InboxDollars doesn't care to keep you as a customer because they realize most people once they reach the minimum $30 payout won't continue, because the amount of time required to earn pitiful tiny sums isn't worth it, so revoke your earnings as you reach the threshold is an intentional part of their dishonest business model. They offer no explanation and no flexibility and no reasonable business practices.