At its most popular ie the OCS and ECS years, most people that bought an Amiga did so for the games. Sure there was Lightwave, the Video Toaster and DPaint, but the A500 plus pirated GAMES (not apps) was what "Amiga" meant to users at the height of its popularity. So the proficency at photoshop argument didn't apply.
the fact is that most Amiga owners i knew had a collection of 200+ games: 195 pirated and 5 genuine. Now if anyone thinks that didn't affect the bottom line of the games publishers and programmers, they are kidding themselves.
Games piracy made Amiga hardware popular initially, but had a huge impact on games publishers choosing not to support Amiga and move on to consoles and PC ( where piracy was a fact, but because there were so many PC's out there, they could still make money, and CD burners were only for the rich, so it was harder to burn copies of PC CDROM games).
In the AGA years, people had huge hard drives ie 1 gig, they had 56k modems, so that it was easy and fast to download a 250k lha game file and store hundreds of them on your hard drive. Consequently, games publishers sold only about 1 in 10 of the games that were being played. Ofcourse that meant they lost money, moved elsewhere, and without software, the lifeblood of the platform dried up.