What is your predetermined threshold on baby-sitting your supporting business partners?

Just curious if you all have set yourself a threshold for monitoring the businesses that you work with? For me, it's suppliers mostly. Good thing I studied early on in my project and kind of had a heads up on this fact.

You ask for something simple and they are dead set on trying to twist you into something they already produce or try to bend you in the direction they want. Are suppliers worst at this? Another one I have to baby-sit is the selling platforms, I've been watching them. One of the big platforms has incurred opportunity cost with me because of the way they built their model, if they weren't so predatorily based then they could probably make more money from me. The same goes for ad platforms, they lose too.

Where is your threshold? I suppose you can't spend your whole business baby-sitting everyone else. It's almost as bad as working a normal 9-5 job where you've got to baby-sit the employer and hold their hand.

Should thresholds be developed? Is this even a thing? Thanks