There are also network effects at play - your co-workers create .psd files, and your printing company takes .psd files, so you use Photoshop. There is also ampl

There are also network effects at play - your co-workers create .psd files, and your printing company takes .psd files, so you use Photoshop. There is also ample training material, frequent conferences, etc. That was Corel's problem - not matter how good a tool they made, printers either could not open the files, or were scared off by bad experiences with previous versions. Google docs has only succeed because "close enough" formatting was good enough for business docs and spreadsheets. Not so in graphic design.