Sure, but then "fantastic success" can be relative to cost of living, too. You can earn an order of magnitude less and still be experiencing "fantastic success" if you happen to live in e.g. Cambodia.
"Appointment Reminder’s key stat of interest is monthly recurring revenue on our publicly available plans, since this is the most predictable revenue in any of our businesses and thus lets me make consequential decisions like “Move the family to Tokyo, where rents are 5X what they were in Ogaki” (that happened, more later” or “Bring on help” (that also happened, more later)."