akcampbell said:
Development quality is more important than quantity. One Last.fm is worth 1,000 templates in terms of raising the profile of an alternative extension. Domainers can contribute to the success of .pro by developing or direct marketing .pro to an end user who develops.
These are true words! Many domainers "develop" their domains by installing a cheap PHP template and copying arbitrary information that you can find somewhere else on the internet, just to have something where they can place some advertisements.
That's okay; I don't want to judge this. But this does not help the .pro extension. .pro needs at least one big community site to become a popular extension, as Andrew already said.
Regarding the role Registry.pro could play: I think you overestimate the possibilities of this company. Registry.pro nearly was bankrupt just a few year ago, and it still is a little rat-shop compared to the other players in the market. It doesn't have some million dollars to invest in marketing.
I'm currently implementing an email providing system, that's why I registered most of my 200+ .pro domains. For me, it's the best extension: There were (are?) a lot of top keywords available, it sounds good ("pro" for profession as well as professional), and it's a better extension for email adresses that .info, .biz or some exotic ccTLD.
However, chosing .pro domains was a pure monetary decision. Nobody will develop a big site just to make .pro more popular, it always is a monetary decision. If I had 1 mio to invest, I maybe had bought some top .com domains. (Otherwise, flickr.com is named flickr.com because the domain flicker.com was too expensive; maybe some time another internet company will choose a .pro domain for the same reason.)
I agree with Steve that low registry fees won't help the extension. You can't just count the registered domains as long as most of them re only held by speculators. In my case, I wouldn't have chosen .pro domains for my business if they'd been much cheaper, because in that case all good names would have been already taken.
I don't want to promise anyone when, or even if ever, I'm ready to start my email service. When my money is used up, and s.o. is offering me a good job, then I'll do that and continue my own business later. It simply is a lot of work to develop a good site.