[vim_wannabe]

I think he meant a paywall, kind of like how some services don't waste their time offering free accounts and receiving tons of support requests.

Billy Gates also famously pondered charging a fee for sending email to reduce spam.

[krapp]

Paying for an account also leads people to feel they're entitled to do whatever they like with it, which might be counterproductive to encouraging civility.

[jhanschoo]

I’ve more commonly heard anecdotes to the opposite conclusion; receivers of free work often value it little and feel entitled to request improvements, while paying users value the service enough to pay.