Here, a lot of people are moving out of the city, buying 5-10 acres, and raising their own cattle for meat, horses to ride, 4-H animals for the kids. They can generate a decent little amount of manure in a short while. Some are getting into gardening, as near organic as possible, and spread that manure on garden space, to improve organic matter, and nutrients.
With farm markets popping up in every small town across the country, market farmer's are spreading various types of compost on their ground, to also build organic matter, and nutrients. Many price new, so when they see an older comparable model selling for 1/3 the price, they buy it. Older, smaller one's definitely hold their value.
Years ago, I bought one of the smallest IH 100 spreaders, that needed some minor repairs at an auction for $20. Repaired it the next Sunday afternoon, and set it out at the road,for $125, which was a respectful price at that time. Came home from work that evening, and 2 guy's parked in the drive, in separate trucks wanting to buy it. The first one there said he was really considering it, the second one said he would definitely buy it, if the first one didn't. The first guy peeled out the cabbage, and bought it right there and then. Now, I'm seeing the same spreaders that people are asking from $500-$1000.