Extended compliance support. Enterprise level needs require a lot of paperwork just to make sure you are in legal compliance with all rules and regulations. The paperwork alone can be a very heavy costly burden on the IT department.
Any distro wanting to be serious in the enterprise space needs to offer support for that. And businesses will pay for it because it's cheaper than having a large staff only dedicated to it. It's part of how Ubuntu can offer you the free stuff and remain a top used distro for the masses. RedHat does the same. RedHat just rebrands the free stuff as Fedora. At least Ubuntu doesn't hide behind a different brand name when offering sercives they charge for.
Only if you want enterprise solutions. RedHat does the same. So does Suse. A business should pay for enterprise level supports and solutions don't you think?