Firstly, if you came across a post and found it helpful, then it has completed more than halve of its intended purposes.
Merit source go around (I've noticed a few), but we can't expect them to pick up everything, that's where users come in, and if you could acquire some merits, then you can reward such posters when you come across their post. Same way merited users also do. So if they keep at it they would surely get merited.