Yes, Of course, there is a limit for earning points per day. You can calculate this limit. Go to earn money at OC page, and add all the total points per each different activity on this site.
Yes ! @smith is correct for giving you really good suggestion. I have also suggest the same actions in my previous answer on this section. You really need to visit the ‘Earn money at OC’ page, and then calculate the total points according to limitations of daily activities.
Yes i read 10,000 points limit in each day you can make its depend upon you how much points you want to make.