Why didn't they use a microUSB charging port

Are they really going to lose or make much money but not using one? Doesn't make sense. Oh well, it's not a deal breaker at all.
Does anyone know the size of the pin or what it's called?
If there is an adapter that has a female microUSB on one end and the charging pin on the other, that would be perfect to keep in the carrying case.
I have a SpaceCase and I used to recommend it to everyone thinking it's the best. Ever since I got a Santa Cruz, I haven't touched the SpaceCase.