Well, two reasons.
First, the cost of boats has gone up. If you look at a NEW (2010) Hunter, you'll see the used one is much less. I paid almost as much for my 1973 Crown 28 as it cost new!
Second, used boats are usually WAY more well-equipped than a new one. I'd bet if you bought that boat new, but added all the stuff that's on it now, it would be substantially more than the $60K.
Anyway, a used boat, if well taken care of, is just as good (usually better, given the extra equipment, fixing of bugs, etc) as a new one, except of course, for that "new-boat smell"

BTW: before you go Hunter, check out a Beneteau or an Ericson 30. Both better built than a Hunter, imho. I wouldn't go Catalina 30, though. Also, an older, better-built boat is often a better way to go than a newer, cheaply-built one. But that's just me: Hell, I bought a 35-yr-old boat!
Let us know how it goes!
druid