That's only part of it. There are plenty of Photoshop users who would prefer to switch but can't because of project constraints, or because it is a required for

That's only part of it. There are plenty of Photoshop users who would prefer to switch but can't because of project constraints, or because it is a required format for some future step in the chain, or whatever. When you need no-hassle first-class support for PSD, or PDF, or that InDesign project that Mary from marketing sent you... who else can you turn to but Adobe?