My guess is only on for high grades. For good, but not great grades, I'd expect you can get a good enough idea from a high-resolution photo, and you're better off rolling the dice, knowing you're not getting a gem mint, anyway.
The other reason to get it graded is it marks that it might be valuable for when you die and family is going through your stuff.
I'd also expect CGC-graded cards to be worth less. I sold all my MTG cards except one (unfortunately, I sold the Beta Chaos Orb), but when I saw the price ($200-ish) of the one I kept, figured I'd get it graded in case I want to sell it. There were two grading companies, BGS and PSA that have been around forever, and I went with the cheapest for grading one card. I didn't recognize the name CGC. The article says they've only been grading cards for a year, and I wouldn't be surprised if people value BGS and PSA-graded cards more.
Does that not mean there’s an almighty supply shock coming to these markets?