Though moderators can't determine if our posts deserve a merit or not one by one, they assigned these thing called "merit source" to do this job. They can pretty much distinguish merit-worthy posts to not. If you are thinking why you don't receive some it's because you're doing this for the money. You just reply and create threads which can be posted on other threads to lessen the spam and you don't interact/discuss thoughts with others. Try to do that more.