Yeah, I'd only be interested in a group lesson if it was aimed at intermediates - people who have a good idea what they are doing but aren't doing it exactly right. I'm not wasting money to have someone teach me square one.
But I'd totally be into group lessons if it were aimed at intermediates that knew the basics already.
You realize that at some point we all have to slow down and deconstruct, don't you? Even the very best do, and more often than you'd think. There are no exceptions in any high skills based sport. Chances are huge that you haven't nailed the basics well enough to progress to the next level. If you aren't ready to be a student and dial it back if asked (there will be both reason and a logical progression and outcome for doing so) there isn't much point in taking lessons. Don't be a stubborn knucklehead.