This is about video game dumps I?m pretty sure, so I?ll move it there unless that wasn?t the kind of ROMs you meant.
Anyways, what a lot of people don?t realize is the companies develop these games on the computer so they?re playing ?ROMs? and that?s how some magazines will preview games I imagine. As for on the consumer level, there are legitimate uses of backup copies such as data extraction. The problem is the internet is so fast now, distribution of backups is very easy.
On a personal level I own a lot of games and have no problem paying for them. Just the same, I have a lot of ROMs of games I don?t own and I?m fine with that too. for GBA ROMs, the biggest factors for me is how it?s played. If it?s an RPG where I could train on the go, I may end up buying it and transferring saves from the computer. But I also love save states and speeding up the game on the computer. Emulators add a lot of functionality and such.