I'll admit I've driven miles for a couple of my scheduler's and 9 times out of 10; immediate money in my pocket did not happen.
I have built goodwill. I have received references for jobs that would've taken another couple of years or more just to get new opportunities.
I will say that not one of my scheduler's have ever used this particular bribe/threat the OP suggested. And if they had I would've dumped them and their MSC in a hot New York minute.
Any scheduler that would try that on me, would get a paraphrased version of 'Hit The Road Jack'. Maybe even take your job and shove it.
If I'm supposed to be a professional, then I have full expectations of my scheduler and the MSC show me the same respect.
Taking a loss from one of my favorite scheduler's, no big deal. Passive aggressive threats from a scheduler, I rarely work with; not going to happen.
Live your life in such a way that when your feet hit the floor in the morning; the devil shudders...And yells OH #%*+! SHE'S AWAKE!