It says his boat's a dog or he's a desperate seller.
I just did a search on YachtWorld
for O'Day 30's and it looks like the sweet spot for those boats is $18K - $25K with boats falling on either side of the bell curve based on those two factors (and age).
The outliers are a Sandy damaged boat for $2,400 and an immaculate Canadian boat
for $41K. It looks like the later model 302's are fetching more than the older 30's. With any older boat a LOT depends on condition - but then you already knew that