Can't really criticise the man for his motives, everyone has to make their own decisions based on what they feel at the time.
Also, I can't say I blame him for quitting. From his perspective it must have been depressing as all hell to be firing out games, having them sell, and then being returned for a refund after having been copied.
Obviously other people stuck it out though, and made a living from it. Fair play to them.
I can hand on heart say that I didn't contribute to his leaving the scene, as I never copied any of his games, as they weren't my cup of tea. I also never returned any game I bought, but I did have a few copies, mostly from friends, so I'm as guilty as the next person of being complicit in it. Mind you, I don't remember playing any of the copied games anywhere near as much as the games I paid cash money for.
In some ways I think you have to pay for a game for it to have any value, otherwise it's just disposable.
These days, I don't copy media for current gen systems that are being actively developed for, and try to instill in my son the value of the games he plays. Obviously we don't buy them new, only second hand, I'm not a millionaire. It's debatable how much the developer's benefit from my pennies, second hand game shops rake it in from me though.