There is a time rule to stop bots if a post is upvoted straight away they know it's probably a bot doing the voting so you get more from genuine people. Take this post for eg Because you made the post yesterday & people are still commenting on it means you will earn more for it. So a post with loads of upvotes all within the first half hour will be worth less than one you put say a week ago that get's a decent comment a week later. It's actually really fair you can't cheat it. They are paying for originality both from the curator that makes the post and comment maker... Kerching.