Well, it's too late to do a real Ship It Saturday (not really but I just worked 8 and half hours so I'm tired). So today I'm just going to talk about why I think people ship in one short paragraphs.
I ship because I have to. I don't know about other people but I feel the need to pair people (fictional characters) together. Example: I just started watching Sleepy Hollow (great show, must watch). Lets be honest, who else didn't instantly ship Abbie and Ichabod. It just happens. It's an involuntary action. I think everyone does it because they feel the need to.
That, and, it's a socially correct thing to do now, so why not.