I feed Euk and Iams products because I can buy them wholesale and delivered (and stacked in the barn) to me. The distributor also carries, crates, leads, treats, toys, etc. - almost everything you'd find in PetSmart, but I can buy at cost.
I can buy the Professional bags of some foods, but with products that don't come that way, I can participate in the breeder program (save UPCS for rebate checks, which I then submit when I buy more). Just leave the check/coupons for the driver, who is a great guy.
HUGE convenience factor - plus my dogs have always done well on Euk.