Comments helps by engaging your readers and they help the post rank for keywords and phrases. Having quality discussions under your posts makes Readers more eager to interact and leave comments themselves.
My Gig will help because for one, I will read each post, this boost your "time spent on site"
I will ensure that I use the relevant keywords and Tags from the post in each.
Each will be at least 50 words.
Comments keep your site relevant because they are considered user-generated content!