Anyone that makes that comment on your post either is clueless or brainless.
Why do the top accounts get the most engagement? Because they create such awesome content. If that was they case they would go somewhere else and make a lot more money. Its because top SP accounts give out the most rewards and when you dont or cant get noticed organically youre hoping for a witty comment to get the author to check out your comment and either follow you for future upvotes or upvote some of your content.
RE: Today I was told "you buy engagement"...