why not? everyone else is doing it! or everyone else has done it already.
i voted no, because i'm worried that you might come back after purchasing it and make a new OMG I LuV trAck 1!!! I lUv TraCk 2!!!!!!! 3!!!!!!4 !!!!! OMG!!!! thread for every song.
or you might go see them live, and post before and after concert threads. for all i know, you might even figure out how to post from the concert and make a thread while the show is actually happening.
but, really, just go get the cd. you might like it, and if you don't, you've got a brand new 15 dollar frisbee which you can use when you take your dog to the park.