Could it be for the notoriety? Adobe is not exactly known for its altruism. It still claims nearly full price for older programs, a gimmick to tease existing owners of their software and a come on for new buyers. Many are struggling with this economy including big business. Adobe might be feeling the pinch too and needs to increase sales to keep the profits coming in and the company afloat. It could be a host of different reasons. But I bet its popularity won't be lost on the boss. Besides.....CS2 is so yesteryear. There are much better proggies out there now. What better way to unload stuff.
come on ... why exactly is Adobe "evil"?
most software companies that sell older versions do not sell them at junk prices. how else would they sell their new versions? CS7 is an improvement over CS6 for example, but not an improvement that would be worth hundreds of dollars.
Adobe donates code to open source projects.
Adobe does release it's own free and/or open source software. Project Rome for example. a pretty cool DTP solution that i still use (you can still find a download link the Mac version at Softpedia, being an Air app it should run on pcs as well). or Source Code Pro for example, which is my favorite font for coding. while Consolas is really good, i like the brackets in Source Code Pro better. (yes, i care about such things.)
Adobe donates software to charities.