Because it's close to Stowe, people would rather go there.
Expensive weekend rates for lodging
I have been to Bolton Valley at least 4 times over the past 2 seasons and have had all around great experiences!
Not to many kids getting in your way either. It's a great "secret spot" to go with your significant other and there is a whole seperate peak with squares and tons of powder!
I highly recommend this mountian if you like to feel like the only person on the mountain during the week.