In the general sense, they're really not that important. You have some colorful ones that make a CD look cooler then you have some really plain ones that don't really add anything to it. I still like to have them anyway, like others said, they come with CD so it's a part of it and it feels incomplete not to have it. It's like buying a CD without the casing or with a missing booklet... it just doesn't feel like you have the 'whole thing' ya know? I can do without it I guess but I still like to buy albums/singles with the obi if I can.
