Yes another person who doesn't understand why the metric system sucks.
American's (fuck yea) use only useful and descriptive units, so obviously MiB, KiB, GiB, etc. because who cares what the closest rounded Ten's digit is? The computer world deals in Bits.
I use Kb, Mb, Gb, in my world (networking). And MiB GiB and TiB when I want to know the actual size something is.
Why use metric? Because the fact that 1440KiB is 1.41MiB is annoying.
It doesn't make it better, it's just really much more convenient when you're working in a base 10 digit system. There are lots of times when the advantages of an alternative unit system outweighs that convenience.
Its a funny thing that so many people are emotionally attached to unit systems. It's a tool, use the best one for the job.