Aisle seats - what's the deal?

So, one trend we've noticed here at the Interactive Conference is folks sitting in the seat at the end of the aisle when there are many other open seats inward. I have a few ideas on why folks do this, but I'm not sure about any of them, really. Is this a well-known tactic of the festival and jumping around panels? These folks seem pretty serious about it. I'm pretty much over having to step over them to get a damn seat. Alright, here are some ideas. Any thoughts?

1) These peeps are super-networkers and need to get back out into the general areas to meet up with other peeps, make contacts, etc. They are mega-Twitters.

2) These peeps want the option to bail on a panel they end up not finding interesting. They grab a seat at the end of the aisle, right next to the door so they can jet with a quickness.

3) These peeps are setting themselves up to quickly get to the mic to ask the panelist questions - and challenge them on whatever subject they are talking about. Smugly, of course.

4) These peeps want to pounce on the panelists right after the talk to tell them how much they love their work and basically goo all over them.

Those are just a few that I thought of. One for sure reason is so they are close to a power outlet and can keep their MacBook Pro running all day. Of course, all the rest of us have to step over their damn cord since it's draped across the aisle.

Anyways, anyone out there have thoughts on all of this? I really do want to know.