I actually wanted to conduct a tag sale after I inherited a house and it's 2300sf of jam packed contents, plus the 1500 sf basement and a 550 sf attic. I cannot begin to tell you how much stuff was in that house. I began a pile of "give away", "throw away" and "sell away" after picking things I wanted to keep for myself. I am not talking about crappy worthless junk, these items were mostly vintage and older from relatives who inherited their relatives estates. Collections of pewter, china, glassware, depression glass and that sort of household stuff.
The "sell away" pile was growing rapidly. My neighbor, who is a tag sale queen, goes to tag sales regularly and has her own tag sales. She told me that people want what you have, but they do not want to pay for it. She said you could have something that really has a $20.00 value, price it at $2.00 and the people at her tag sale would offer her a buck. Hardly worth the time to clean it and price it and display it on a table. Many people who tag sale are not poverty stricken but are collectors and KNOW the value of things but pretend you are selling your junk and want to give just pennies on the dollar.
This discouraged me quite a bit because the items I wanted to sell were not old clothes, dirty un matched jelly jars and floral vases, but some genuine antiques, vintage sets of glassware, bone china, Victorian dishes, wool rugs that were still wrapped after being cleaned and moth preserved.....blah, blah, blah. I decided that I was not going to put myself through the hassle of conducting a tag sale because it is a lot of work (well, at least the amount of things I had to sell). I would be angry if I had quality items, fairly priced, just to be asked to further cut the price.
I found that selling things individually through ebay, craigslist or on-line tag sales is so very time consuming. It would take me forever to get rid of this stuff and I had no space to store all of it.
So, I sold some stuff in bulk to estate buyers, donated a bunch to the Good Will and other charitable organizations and high school tag sale fund raisers. I valued everything for the going resale rate and took a deduction off of my IRS taxes.
People KNOW what they are buying but play dumb and poor, they do.