Yeah, the corporate measure for "good/bad UX" is pretty much "how many full time employees will we have to hire to deal with the worse UX or how many employees will we be able to save due to the better UX?". Convenience matters for productivity, but usually not that much - I have seen some UX'es so bad that you'd have extra dedicated employees just to deal with their horribleness, but even then it's cheaper just to hire one or two extra people than spend many millions and person-years on system migration.