If you're gonna buy a ticket, you shouls get one ASAP. I checked the "best availalble" seating on ticketmaster the day after they went on sale, and it had seats available around EE. As of this a.m. (3 days later), the best seat out of all the shows was row C. And now its at row G, 10 hours later.
As far as the lower price bracket seats go, the best seats right now are like the 4th row from the back (pretty sucky). And the lotto's only $20, so I'm betting that a LOT of people are going to "hold off" until the day of in similar hopes- there might be quite a few people there.
"We all get blue, I say,
Hang on tight, I'll be your bodyguard."
-Tick, tick..BOOM!