Re: Are SAP unique in this?
I think more companies would do it if they could, but SAP have the benefit of providing a very expensive product that takes years to integrate into a business, but once it has been, it's totally embedded. It would probably be cheaper for some companies to shut down and reopen under a new name than to remove SAP from their accounts department.
I guess there's not a huge amount of competition though (and at least moving to SAP got rid of our finance director's multi-GB Access database that he used for month-end, which invariably needed fixing every month)