I work manufacturing as an operator and make $30/hr. A sub-supervisor position opened up and I was offered it. I told them I would consider it. I learned that the role of the position is you're essentially filling in when the supervisor is not there (not out of the ordinary). What I also found out is you hold the position, but you only get paid for the position when the supervisor is out and you are covering. The raise is $1/hr.
I told them I fundamentally disagreed with that kind of raise, I am an hourly employee and I have never worked a job where a promotion came with that kind of provisional pay. Not only that, but a 3% raise? No thank you. Our annual “cost of living” raise was higher than that.