Like Duchess said... there are a lot of people who benefit from leasing... The people who want to lease may do it because they either don't want to commit to ownership or can't afford the purchase price of a valuable show horse that is just an 'extra' for the owner at the moment.
This stable gets the best of both worlds, they get to lease out the use of the horse, without losing tabs on their care, because they stay right there.
I can see the advantages now that AAM posted. It just seemed a stange e mail last night though.