I don't agree with that. I've always seen merits of good posts; you might be referring to posts that are technically good but are answers that are commonly replied like "your best choice would be to use a hardware wallet because etc etc...." . There's enough enough sMerits in circulation for the good posts out there.
No I'm not talking about such posts. They are indeed common and don't deserve merits.
Okay, I agree that legendary should be hard to gain. But some people became legendary just for posting while others really need to work hard to get the same.
Also, what do you say about abusing system? I think many people may have several account and give merits to themselves or obtain merit in some other unfair manner.