I've worked for several MSPs this is my experience.
They are very keen on getting employees with existing certs or getting current employees to actively be getting more certs.
There are specific incentives from microsoft based on how many employees have certain levels of microsoft certification. it comes with discounts and marketing materials/privileges (Who doesnt want to say they are a Microsoft certified Gold support partner?)
As such, it is conveniently ignored that the guy with an MCSE isnt going to get fired because their gold level partnership lapses if they dont keep X number of MCSEs on staff