It's been 8 years since they revealed their pricing model, which has remained mostly unchanged on the lower end and only adjusted on the high end to account for GitHub Enterprise and suggest people move to that instead of the gargantuan $3k/mo plans. I don't know many SaaS companies that don't tweak their pricing much more infrequently than that. Thoughtbot's Giant Robots Smashing into Other Giant Robots podcast for the past few episodes has been consistently talking about A/B testing pricing models, prices changes and signup, conversion and churn, as a weekly adjustment on some of their services (FormKeep, Upcase, etc)
