Having a per-user pricing model also helps :)

Sorry not trying to detract from the stat, but it's worth adding that bit of context. Per-user priced startups who create an awesome product are in a sweet spot when it comes to ramping up their paying customer metric. I admit I'm quite envious of SaaS startups like this, or like Slack that have nailed it on execution and can linearly scale their price according to the size of an organization.

Definitely something I tell new entrants to SaaS to bear in mind.

(I run a SaaS based on the more traditional "3 plan" model)