If someone uses your product or service and has an issue, the first contact they have with your company is through support.
A crappy support experience could easily be the difference between having a life time customer valued at thousands of dollars, or your customer feeling frustrated and going to another company, netting you $0. That has a butterfly effect too because having 100 happy customers who are praising your support could lead to many new sales from organic recommendations. Having a bunch of customers who felt neglected by your support could yield a situation where your company is now on the front page of HN for having bad support or worse.
For whatever reasons, bigger companies focus more on measurable metrics like "tickets closed per hour", where the emphasis is on things that aren't important because measuring customer happiness is pretty subjective and doesn't translate well to employee evaluation scores.
I know if I ever got the point where I would need to delegate support assistance to someone, you can be sure I would pay them amazingly well, at least equal to a developer's salary because I never want anyone to ever feel like they get ignored or have a low quality experience with my products.