[Jochim]

Pissing off your supplier is something everyone has to be careful of. If you're drawing little swastikas on your cakes while telling everyone how great "Phil's flour" is then don't be surprised when Phil doesn't want to associate himself with you any longer.

The sibling comment pointed out that vendor lock in can be a problem which I agree with, but I think for most of the industry that's a problem of protecting yourself from predatory price hikes/services being deprecated rather than the problem of actively pissing off people you need.