Your comments

Will definitely lead to less comments in articles, lessening the experience for current premium users, maybe making them question why they are paying to be premium.

I would pay maybe $5 a month for greater access, but no more than that.

flintstone277, I am in total agreement with your take on this.  I, like others, will certainly be using this site less, so less eyeballs viewing the advertisers.  I hope their premium viewer revenue outweighs the loss from the ad revenue.