Guess it depends on what you are selling, and your time. I am not giving most of my stuff away! It usually is in good condition, leather is soft and flexible. Things are CLEAN. Halters, blankets, leather goods. People appreciate things being clean.
Most of my stuff is priced at about 3/4 cost of new, in good working condition. Saddles are not high priced because they were middle-of-the-road prices when new. Good leather, but not thousands when new.
One of those “you can always come down” during the dickering. Can’t raise the prices once you start! Starting with a higher price lets you still get a fair value if price is dropped. Anyone who doesn’t ask about a lower price at tack sales wasn’t raised right!!
As 2Dogs said, you can find some excellent values on things by looking around. Sales here often have a “no early sales rule” to prevent vendors buying the good stuff early. They say you will be asked to leave!!
I usually make pretty good money at tack sales. This is minus your booth and lunch costs. There are a couple REALLY GOOD sales that see lots of buyers come thru. Two I sell at, one I shop at. Usually I see folks I never see otherwise. We catch up as they shop, so a social event for me. Pocket full of money is nice too. AND less stuff to maintain at home. I have stuff packed now, ready for my first tack sale in Jan. And somehow there are now 4 lovely saddles to go, none of which I ever sat in on a horse!!