I, too, made the switch from pirating everything to buying everything right about when I switched from Apple to PC. Part of it was the stuff factor and part was the guilt factor.
The stuff factor was that most games I played came with a huge manual or a box full of feelies. If the game didn't require an engineering degree to play (as did some flight and sub sims) the manual would be rife with researched history, fabulous illustrations and such that were relevant to the game. Ultima's cloth maps were a particularly nice touch.
The guilt factor stemmed from the group photo in the back of the manual of the development team. It was a lot easier to steal from one coder working in his basement (especially when I was one such coder, and relased my products for free) than it was enough faces make two rugby teams.
These days, I STILL buy my products, despite the facts that I can afford them less and the manuals, group photos and feelies are pretty much absent unles one acquires the deluxe verions (which I don't). If the present DRM trend continues, though, I cannot vouch for my contiued virtue.
U.