I actually think we agree that the value proposition is currently there for pro, per what I laid out in the piece (though of course I look forward to things that will further increase its value). My comment was supposed to make clear that adding more ads to Pro could undermine that value—but it sounds like that's not the plan, which is great.
We’re allergic to ads. If I knew how to make Flickr work at its scale without ads even on free accounts, I’d do it.
Since I can’t figure it out (yet?), free accounts have ads and Pro don’t. As long as I’m running the show, that will remain true.