Because I am lazy, and because blogrolls bring out the high school in people, and because really, what I read or don't read isn't actually any of your business.
I recommend this policy to anyone else who shirks maintenance, hated high school, despises ineffective feel-good activism, and doesn't care if his or her inbound links go to hell or not. It is a sound policy that will save you much annoyance.
You can tell me what to read and what to link to when you sign my paychecks. Until then, don't spit in free ice cream.