Re value of used items...I always heard that the rule of thumb for pricing a used item is half of the original, regardless of condition, or less. I sort of use this when shopping. Most retail items are marked up to double what they cost to begin with (for bartering with a shop owner...) My ex used to own a hardware store, I assume that is still the way things are priced.
Before life as I knew it came to an end (divorce) on the farm I had a few years ago, I was poised to sell shares of hogs, steers, etc...the person would be part owner of the animal(s) and contribute feed or feed money and get a share of the meat which we would kill and have butchered. It never actually happened.
CURRENTLY I have a friend at work who has "bought" some chickens vicariously from me at her request and idea. She insists on giving me money for "her" chickens, I have been bringing extra eggs and she got some, I didn't want her to pay for them (for one thing we are not supposed to sell things at work) this year as I'm just getting started and am not doing well at marketing them AND working a "real" job (which anoyingly happens to tie me up on the best days to sell at the farmer's market AND the livestock auction). Anyway, she is older, has elderly friends who enjoy this whole thing...I also provide photos. I have invited my friend to bring her friends out for a visit. So this is fun as well as helping me alot with feed bill!
I've wondered about renting chickens like for the summer, for a scouting project whatever...build a good moveable pen, teach the people how to do it, go get it when they get tired of it or the neighbors complain!