> other CAs aren't prohibitively priced
Not if you look at the per-cert pricing, but if you factor in the cost of "dealing with incompetent sales" and "convincing accounting to keep the contract going", they absolutely are.
It's not only the sellers of the other party. You have to work with the buyers of your company too. Stuff that costs no money and needs no contracts move faster than stuff that must be negotiated, agreed upon, paid for.
When I was working with Digicert a decade ago, it was expensive, but they also had knowledgable support and with a wildcard cert, they would issue all sorts of 'custom duplicates' by request that were super handy. No incompetent sales, but certainly you do need to make sure accounting will pay.