Yes, it's like having horses at home only you have to drive there.
Other potential pitfalls of self care, these vary greatly depending on the other people at the facility:
Hay-you have to buy it & store it somewhere. People can steal your hay, same goes for grain.
Feeding schedules-it can be hard to feed your horses when the other horses around you are begging for some too. Your horses will be begging at someone else's feeding time.
Responsiblity-There always seems to be someone who doesn't take care of their horse/s-how will you deal with that? Is there a barn manager to assure that all horses get proper care including deworming & vaccinations? Will that person step in before a horse has to suffer?
Cleaning- you may keep your stall/area clean but if someone else does not you share their filth.
If a horse gets injured/sick or needs some sort of attention & the owner is not available is there someone who can handle it?
So many times we hear stories of people getting mad that someone watered/fed their horses instead of being grateful.
A daily hands on barn manager who is not afraid of hurting someone's feelings can be the difference between a good or bad self care facility.