I dont think that is coercive. I dont think coercion has anything to do with finding the value. It is "coercive" if he puts a bullet in your brain if you buy neither option.

Legally have “sex with me or lose your job” is considered coercion without any direct threat of force. Sleep with me and I’ll pay you 10k isn’t.

The difference is leveraging something else in the transaction not just payment.

By that definition a 150k car clearly isnt. It is obviously payment inside the transaction