Do competitors patronize sponsors? Absolutely as they should.
The time, energy, money, and heartache invested in getting a dog to compete at the national level is so much greater than the cost of dog food. I can't imagine that any of these competitors would skimp to save a dollar on dog food. I'm pretty sure any dog food company would beg Danny Farmer to use their food.
I'm not saying they are skimping, PPP seems pretty comparable price wise to a lot of the top brands. It's more of a what is the breeder, kennel owner, or dog handler getting out of promoting PPP question for me. I have a hard time believing that one quality food is that much better than another quality food, it's the same thing when it comes to pro staff for fishing gear, hunting gear, or anything else where they have a prostaff. And heck, the sponsorship game is filled with people claiming to use one product but actually using a different product marked up to look like what they are supposed to be sponsoring. I mean heck people will even argue that you can't trust your vet when they recommend hills science diet because they give a lot of money to vet schools. And to be clear, I'm not saying PPP isn't a quality food.