One of my business classes did an experiment:
You and a partner are given $10K to split. You have to propose the split but if the partner rejects the proposed split, you both get nothing.
Most people proposed a 50-50 split. Some a 60-40 split. I had a weak partner and proposed a 80-20 split which was accepted. I would not have tried that with a stronger, more principled partner.
Moral: Know who you are getting into business with. Weak or strong, principled or open, etc. Yes, I’m an ass but it was hypothetical and I did it to prove a point.