The bar points, as well as the points you earn from your referrals, are converted to cash according to your monthly individual payrate. It is based on the number of Special Offers you sign up for during a month. Thus, the more Special Offers you sign up for each month, the higher you individual payrate for this month will be, and the more money you'll get for your bar and referral points. You can see what your individual rate for making money for the last month is on your My Statistics page.