Yeah, but there's a good chance the parent poster is worth more the $7.50 ARPU to Twitter. They can also probably increase their ARPU more than they can increase a hypothetical subscription cost, which is why these comments about ad-based companies providing a subscription service aren't actually these no-brainer ideas.

Now with that being said, it would be nice if companies cared more about having sustainable businesses with healthy, non-intrusive user experiences than revenue growth.

The people willing and able to pay to opt out of ads are worth much more than $7.50.

+1, thanks for the link.

Since the original article is more about Google, I would like to say that while Google's paid gmail+office is a compelling product that I liked paying for until I realized that there was no way I could merge services bought with my "free" Google account with the paid account. I think this is a lesson for Twitter if they ever do offer a paid service: integrate well with the old free account or convert old account and history smoothly.