That's sometimes why in some parts the amount of merit distributed is very small. Merit sources or regular users only focus on technical posts so that most other reasonable posts are ignored. In fact - there are many general posts that may require the poster to think critically and pour out their thoughts into one post. I know the quality of posts is subjective from one user to another - but if the merit source only focuses on one category of posts, then the others will be ignored.

So far I haven't found any particularly stingy merit sources - I think they're all very generous. They'll be considered stingy by those who feel dissatisfied or unhelped - but when you call yourself stingy for certain categories of posts, then that's your choice. One of the requirements for being a merit source is being an established user - that means they can judge posts from different categories well without personal sentiment or ego.