Estate sales can be brutal. I didn't realize that, at least in my area, people put little trinkets (bottle caps, paperclips, playing cards, etc...) on the front step to indicate their place in line now. I thought I was first in line at the last estate sale I went to, only to discover that I was about 8th. Ended up missing everything I was interested in.
I've had people literally push me and my wife out of the way to get to stuff. It's like a feeding frenzy at these things. Ugly.
I've basically stopped going. I prefer auctions and craigslist, however at auctions lately everyone seems to think they are bidding on Action Comics #1 on every comic.