To understand your question you also have to understand that you don't talk to MF schedulers. They call themselves schedulers because that's the title MF gives them, but they are not in any way schedulers. Also you have to understand that MF "schedulers" don't actually have the ability to tell you what the max fee is. The can only tell you what the max fee they know will be approved is. And those are entirely different things. Basically it works like this:
Let's take FF drive in shops.
When all of September shops get posted they have a fee they are posted at. As the month get's closer you will receive Samantha offers or Premium Fee offers from MF. Those are figured by a computer based on how close you are and how much the computer thinks the shop is worth right now. So let's say it's the 30h of August and no one has taken a shop yet. Their computer will know based on history how much they normally have to pay to get that particular shop done if it has not been taken by the 30th. They'll adjust from there (down? the same? up?) I honestly have no idea. And that's what your offer is. At the same time the overseas schedulers start calling shoppers. They have guidelines on what to offer for each shop. The schedulers are not allowed to put in offers over what their guidelines call for. In this case their computer says the shop is worth $16 but the scheduler's guidelines say they can't put in an offer more than $15.
Now, to explain what I mean by them putting in an offer, I'm not talking about what they offer you. When they say I can give you a shop for $15, what they really mean is they know if they submit an offer to the schedulers for $15 on your behalf it will get approved. That's also why I say they are not schedulers. Schedulers sit in some room and look at job offers all day. So what happens is a scheduler calls you, says I can offer you $10 (even though their guidelines say they can give you up to $15, they're trying to save money remember), you accept the offer, and they put in a request to a scheduler asking for the shop at $10. A scheduler then looks at that request, approves it, and the shop is assigned to you.
Back to the whole "Max Fee" thing. Many times you can get approved for more than what the scheduler says the max fee is. Again, that is just the max fee they can offer you. I once had a scheduler on the phone about a particular drive in that I get $65 for. She told me it was too early in the month and there was no way she could submit that offer, and that it wouldn't be approved anyway. After hanging up I submitted an offer on the website and it was approved immediately.
There are reasons that a body stays in motion
At the moment only demons come to mind