That is rude! I cannot believe those ppl. I barely go to yard sales these days but I do haggle, but I'm not rude about it. It's up to the seller if they want to accept that price or not and it's up to me if I want to pay it - bottom line. There is never any reason to be rude. And as far as ppl stealing, how low.
I don't know how some can deal w/ their conscience b/c I wouldn't be able to live w/ myself knowing I stole from someone.