The "support contracts" also gain you access to developers when needed. At times I have had enterprise agreements with both RedHat and SUSE. On more that one occasion when facing esoteric bugs we have been able to escalate via our support contracts. As soon as they were able to reproduce the bugs they are were able to drive upstream code changes to fix the bugs.
Conversely I have worked directly with a number of open source software developer to address bugs, but I will say that it was much effective working with developers that are paid to address bug and already a reputation in the open source community. Because my team's time is much more valuable than the cost of enterprise support contracts I would much rather keep them focused on much higher value activities.
To put things into snarky terms you might understand, "real" Linux is a complete open source ecosystem of capabilities and services. [snark mode]If you do not need an enterprise support contract it is likely because you do not provide much value to a company and so your time is best spent tinkering and chasing down issues.[/snark mode]
The point is I know how to grow my own food, but I still go to the grocery store because my time is in demand. That doesn't mean I don't appreciate my neighbors who have beautiful gardens, and I doubt that they think of me as incompetent because I go to grocery store either.