Software Vendors - Video Game Vendors in specific devolop cdkeys for a very clear reason. To get people to buy thier product. They cannot stop the data from being ripped from the end-user's copy... But, they can control the master server query - and ban your cdkey accordingly. It's not impossible to make a cdkey match a certain cd... but in most cases, it would be useless... and costly.
I'd say, serials have become "popular" again for this reason: The internet! It's alive an poppin 24/7/365!
Not only that, but our home technologies are
finally becoming sophisticated enough to rip a freakin cd!
I think the gaming industry is going to tilt more to Pay4Play games now... for many, many good reasons.. and some crappy ones too.
Anyhow.. there's some input.