Probably because they feel their time is too valuable for that learning curve, or because even by spending lots and lots of time on learning, you still can't ma

Probably because they feel their time is too valuable for that learning curve, or because even by spending lots and lots of time on learning, you still can't match the productivity of somewhat usable software (please note that I hate Adobe as much as the next guy but they're lightyears ahead of Darktable or Gimp)