One way of getting people into someone's music would be to play them their songs... In which case having lyrics might be helpful, and since one often plays songs on computers, it makes sense to have digital texts available somewhere. I have found myself searching for lyrics for albums that have lyrics printed in their booklets, simply because they were important to the song, and would help someone appreciate it, but obviously I did not feel like typing the lyrics out from loooking at a booklet. Of course, once someone likes a CD they should buy it, but the decision to do so can often be based, in part at least, on what the songs are about.