is it my or does 625 million seem a tad excessive for a feature of the phone that isn't totally central and probably is used by maybe 20% of phone users? Apple

is it my or does 625 million seem a tad excessive for a feature of the phone that isn't totally central and probably is used by maybe 20% of phone users? Apple has sold maybe 800million iOS devices. Say 400 million that support FaceTime. $1.50 per device. wow. Or 625,000,000/ 14 employees.