I always laugh at the people with join dates in the last year or 2 and like 8000 posts and 10,000 likes. As if it's some sort of badge of honor or something.
Like you said the "like" button is fair recent as in the last 2 years or so. Us old timers didn't have the "like" button. I usually just replied to a post and say "this" or "yup"

I honestly don't care about anyone's post to like ratio. The only thing that's fishy is if someone joined in the last year or so and has a ton of posts and hardly any likes. Basically means they are a troll or are super boring..lol