That, and I can hear the difference of a cd-r and a pressed cd.
>Yeah man, those ones and zeros sound a lot better on a pressed CD?!?!?!?

The only reason you can hear the difference would be because those songs on the burned CD are probably sampled at a different bitrate.
However, burnable CD's do infact deteriorate much quicker than standard discs.
In any case, there is something rather nice about buying the actual official CD as opposed to copying it.
It is good when people buy CD's. And I like the whole mp3 thing. It is a great way to discover new music. It is a good way to find new CD's to buy.