I'm obviously not even to that point in my life yet, but, I am looking at a certificate for these reasons:
I know anything I learn software will be out of date soon. I dont want to spend an incredible amount of time working on things I dont need that you must complete for a degree.
Money. A degree always costs more.
Time. I want to be done with college in two years.
Money, reason two: The more classes, the more text books!
On the other side:
If I couldent get a job in the System Administration career I wanted, I could work higher up elsewhere, since I would qualify for all sorts of jobs. This is the only major strong point of a degree I can think of.
Also, a tech person just warned me today:
Stay away from technical schools. Lot of money, lot of time. He got out with an education, but, it could have been more for what he paid for.