Also limited to geek level.
I have yet to meet any person in real life that knew about Sailfish before i evangelized them like a vegan.
If you do not follow tech-channels, there is no chance you ever heard of it imho.
Thats why i took the indian example.
People just wanted a cheap phone that does calls and Whatsapp. "Dis no work" was their answer...

My guess with ~50000 users is based on current Alien Dalvik downloads from store (yeah, lol, speaks volumes).
Most people do it only once.
Before intex public release it was at around 15000 for Jolla1,C and tablet combined.