The ROI is actually much better than that but I wouldn't look at it that way. Yes, it is possible to make good money on here if you make lots of posts and have a lot of money to spend on paid upvotes. But 50% of your earnings are not liquid and you are subject to the volatility of the crypto market. Not a good combination.

Also, the ROI does not increase daily. Normally posts are upvoted within 1-2 days and the rewards stay where they are.