Basecamp is a scalable business considering what it is but I doubt that 37signals makes tons of $$ with Basecamp (check their Alexa traffic, it's an aged product and overrated, popularity still comes from Rails, most that I know switched years ago to other tools).
> I don't think DHH gives a shit about Pinterest, Quora or Instagram
http://37signals.com/svn/posts/3177-all-the-oxygen-trapped-i...