Oh, I'm definitely not knocking RoR or Python. But they certainly seem to be in significantly less use than PHP and ASP.Net (using Indeed's jobtrends as my ubiquitous measure of reality, RoR + Python jobs count approximate PHP or ASP.Net jobs count).

Since I assume that the total number of jobs in a given field are proportional to the number of open listings, and since I assume that the number of skilled developers is tied to the historical job number, I am led to imagine that there is a much bigger pool of skilled ASP.Net and PHP candidates out there.

Basically, it sounds like these guys are just manufacturing their own dearth of job applicants. They're using hot, newer technology and flying to the most high-demand location to seek talent. If they made their products in ASP.Net or PHP and hired from other areas of the country, I'll bet they would have no trouble getting their product done quickly. But that's less buzz-wordy and they couldn't live their rockstar-wannabe fantasies.

(Note that I'm not making any claim as to the superiority of any language, or potential speed of development)