While paid-to-post sites may not earn your rent or grocery bills, they can certainly sweeten your life with small indulgences like buying chocolates and ice cream, and even a pair of decent shoes or a treat in a restaurant (if you happen to be in developing country). It is not recommended as a primary income source because of poor time-to-earnings ratios, you can certainly use these platforms to supplement income stream. Apart from RIF, what other PTP sites are you using?