Ojooo is an amazing website, able to make you earn more than other PTC. Why? Because the cost to advertise to very cheap, so you gain faster. The upgrade premium+in only 39$ for a year, getting you between 30 and 35 ads day, and rented referals is between 0.06 and 0.15$/day.
In terms of paid to click it is one of the best site to earn money.
With a free account and 100 RR, and 0.06 per rented referals a day, you can earn 512$ a month. Say you have 200 rented referals, if each of them brings you 0.06 then that makes you twelve dollars a day, minus the investment=10.57$ per day. making you win 317 a month. And so on: at 1000 referals. you can earn 4200 dollers a month.