My mom, sister and I went in on one at my sister's house. We made about $2700 total, although only about $1100 of it was mine. It was mostly clothes, some household items and some toys. The most expensive item I sold was $50 for an old Beta movie camera and some blank tapes. I still can't believe someone actually bought THAT. We had it for three days (Thurs.-Sat) from about 9-3.
The funniest part is that it was a neighborhood garage sale, so about 40 houses were having one. My nephew put up a stand and sold hot dogs, bottled water and soda. He made over $175 profit! We had a ton of business just from the people who came for hot dogs and stayed to look at our merchandise. My dad helped him set everything up, made sure he used gloves to serve the hot dogs and kept things at the proper temperature. We bought all the supplies at Sam's Club, and sold the hot dogs for $1.00, bottled water and soda for 75 cents. I never thought he'd make any money but he did great!