It is super frustrating to buy a game or movie you end up not liking or that does not work well with your system. In the distant past that lead me to "other" methods of procurement, however if I enjoyed a game or movie and it played nice with my system I'd buy a copy (or several). The "other" method became effectively a demo.
I bet I've purchased a dozen copies of FarCry over the years.
Now with actual demos or the ability to return a game on Steam (if you do it quick enough), combined with games tending to work better than in the past, the need to use "other" means is virtually eliminated.
In the old days I preferred the "other" copies even when I had a legitimate paid for disk because no disk was required. Or I'd make a disk image of the real disk so I wouldn't need to carry disks. Of course now with Steam you mostly just need an internet connection, which is handy, unless you don't have said connection.