I'm a BO who does not offer self board. Here are my reasons.
-Most people do not realize the amount of time involved-every day
-Anything not done I would have to do. I plan my day according to what needs to be done. I don't want a dirty stall or water bucket waiting for someone to come & clean it. I also don't want any last minute phone calls asking me to feed or clean because roads are bad, hangovers, sick or have something better to do ie: more fun
-Feeding would have to be done individually & that may mean bringing your own horse in to feed, then turn back out or require individual turn out. How many times will someone hang around while their horse munches on hay before they are tired of doing that? The horses here are in small groups when outside & eat breakfast & lunch outside when not on pasture.
-I don't have room for people to store their own feed/hay/bedding etc.
-Too many stories of people buying bad hay or running out & stealing good hay from someone else
-If someone runs out of food I would have to feed their horse my food anyway
-I feed 4 times a day every 6 hours, the last feeding after midnight. I couldn't feed only mine while others nicker for some too.
-Many self care boarders get the "it's none of your business" attitude when it comes to how their horse is taken care of, which can cause problems. If a horse is at my place it is my business
-I don't want to be a nagging baby sitter
-The horses here get a high standard of care & the only way I can ensure that is to do it myself.
I hear of some self care facilities that run smoothly but I've never personally seen one where at least one horse didn't get pity from other boarders because of the way it's cared for.