I guess they figured that their standing with their customer-base is so low it simply cannot get any worse, might as well make some more money off the id... sorry, consumers, who are still using sony products.
Second hand games may not bring any income to Sony but the person selling the game then using the money to buy a new game does bring in new money to the company, so I really cannot follow their thinking here.
... but then again, I would never have closed down Lik-Sang, installed rootkits on CDs, ignored all security best-practices in everything I did and then proceeded by crapping all over the people who still payed for my products, I guess me and sony have different ways of looking at things.
I hate sony, there are other companies I dislike and would be reluctant to buy products from, but I hate sony. I do not buy anything that has the sony name on it, and this includes sonyericsson phones. I realize companies are in the business of making money, but most have realized that crapping on customers isn't the best way.
... and, if any of you think Sony is better at running a business then I am, you should consider the fact that I have made 4.7billion USD more then Sony PS Division between 2007 - 2010.
http://www.vg247.com/2009/10/30/sony-ps-division-has-lost-4-7-billion-since-launching-ps3/