Are You An Innie Or Outie?

I was outside having a smoke and it had never struck me why some people park facing in and some facing out. Most people do this every time they park their cars. Why?

Well, it struck me that the people facing in (towards the house) probably like their home life better than work, because they didn't want to take the time to back in for a quick departure. I expect these same people are more likely to back their cars into a spot at work, because they want that quick way out.

I know I am guilty of parking facing in at home and backing into a spot at work. Any other thoughts anyone?