Love the attitude. Since this is your first SDCC (I think), I would recommend you maybe buying at least a badge for one of the days so you can fully enjoy everything and wander everywhere and not have to trade 3 hours for it.
I've actually thought about this, possibly trying to buy badges for Sunday, as in the past that's when the Doctor Who events have happened.
I think what I'll do is try for Sunday when badges open up, as well as help out anyone here to get badges too
And if we don't end up being able to pick up badges for Sunday, then we will volunteer that day.
Question though, if we get there wednesday, do we have to wait until Thursday to sign in? It seemed like the rules were a little unclear on that when I read the orientation packet.