Do the agility people not want your rental fees? I know that with a club I'm in (non-dog, but still) we depend on the rentals to supplement the income. Especially heating in the wintertime, lol! We have exemptions for the rentals too, which in your case would include the prong collars, by comparison. This sounds weird to me, that they'd willingly lose that added income. And yeah, the barking part is outright funny, lol.