I used SAP at work to keep track of monthly working hours. The GUI had this... feature that doesn't allow you to resize the form you're working with. And you can scroll vertically, but the first columns are frozen in place. As a result, only 15% of your screen is usable, showing 4 out of the 30 columns you need to fill at a time and requiring constant scrolling.
As a user, I would have been happy to dump it and use anything else. But who am I going to complain to? I'm not the customer, my company was. And it's not like they are going to switch ERPs just because employees hate it (which we all did). Even if they wanted, the cost of switching now would probably be astronomical - not only on migration, but also on training and support.
It's no surprise that SAP is worth that much, seeing as they have the perfect captive audience: the wealthy kind.