I have seen them. I also have a good response, a quote, actually, from a Stephen King book that I use as a reply. But, I'd probably be banned for life posting it here, lol!
Their company's policy, or because they can, will not, cannot, and should not, affect my broker, my company, our clients, or my personal bottom line. We do not work for "them." As IC's that signed with one company, another broker can't tell us that we're going to pay them, some made up, good for nothing, BS fee!
A company here tried this, and tried to put it their standard purchase agreement. It lasted less than two secnonds.
Companies should be checking w/legal type people & their states' DRE before doing cr*p like this.
~So not legal advise.