If writing random comments is important to you, then keep it up. I certainly wouldn't want to discourage anyone from writing anything, even if it doesn't make sense. Half my freewrites don't make a whole lot of sense.
What had freewriting cost me?
Well, I now am writing again (every single day for the last three months). I have 'met' a whole bucket full of like minded idiots (no offense Snook and Byn, but I do mean you!), who seem pretty damn nice. I can't seem to shake them off, and they keep kindly upvoting the nonsense I churn out, and leave me encouraging comments when I am feeling down. I've earned steem power and STD that I have vested in this network. Oh, and one of my stories was selected by the Isle of Write to appear in a forthcoming Anthology (it was not a freewrite story, but as I explained above, if I hadn't been participating in this freewrite challenge every day I would never have written it).
I think I can live with those kind of costs...
But maybe not everyone can.