There's no problem with suggesting it since you never know who may be listening. I find, from the adopters I've interacted with at work, that they typically go with whatever they're used to feeding their dogs in the past or whoever has the biggest TV commercial. I used to be real gungho about food, but now I don't bother unless they seem seriously interested.
Pookie, Papillon 4/17/09
Kaiser, GSD 4/14/11