Your actually wrong on this. I just got turned down for my third job in a week for not having Mac certifications. That was the sole reason for each one I applied for.
If you look at a number of IT jobs lately they want Mac certs. I never thought I'd see the day since it was always a "PC only" area and thats what I focused all of my skills on. Macs are becoming more and more popular in the work place, especially in areas where there is any sort of media development.
This isn't the case for every company but the list keeps growing. Even positions at my last job now want Mac certs.
what area of work are you in? if you don't mind me asking that is.
I am a drafter and been to a hand full of offices for work experience, and have not seen one mac. That is just one field though, and it probably depends on your field.