When the value of the relationship goes away, so does the relationship. You can get compliance. You want buy-in.
Compliance means people do what you ask because you have authority. Buy-in means people do it because they believe in it. These produce very different results — and very different cultures.
The terms of the deal make the deal. Bait and switch at your own risk. People remember when the deal changed without their input.
People will support what they can help to create. The most effective way to build buy-in is to involve your people in the process — not just inform them of the outcome.
If you are working harder towards the achievement of someone's goals than they are, you are out. This is not callousness. It is the most useful boundary you can set as a leader.
The 50/50 rule does not mean you only give 50%. It means you don't meet people where they are — you create a new standard and guide them forward. You push away the interested and pull in the committed.