After trying to call RedHat for support once a couple years ago and then being told that our paid subscription didn't include support (a side effect of the academic subscription we were on), we ended up just saving the cash and moving to CentOS for everything including production. For the rare few times that we need a support number there are a lot of 3rd party companies happy to do per-incident coverage of CentOS - or we can still always setup a matching RHEL instance to reproduce a problem in if we want RedHat to look at it by just keeping a couple of RHEL entitlements active, no more need to entitle at scale though.