"...where they directly approach our customers offering to support RHEL"
It is hard to imagine companies falling for that. If your business depends on your RHEL servers working perfectly, you really want to get the best support. Nobody else has even near the amount of developers working on all core Linux kernel/RHEL userspace features than what RedHat has. Anyone else as support provider, and it is completly upon your luck the "anyone else" has employed anyone who can actually fix your problem.
Saving $100 a month by switching imposer support, and you are just risking your business. RedHat can validly point that out instead of resorting to the "patch-flattening" trick they did.
OTOH if you don't really need support, why pay someone else either? Just go with Centos/fedora/debian/whatever and support yourself internally. Chances are that you can find fixes with google and git just as fast as the imposer-support can.