Probably because it's not worth celebrating.
To be honest, misery is the Democrats ally. Where do they get most of their support from?
From the poor. What better way to increase their base then to put more of us into that category.
Well sorta. See the misery caused by Conservative policy is an ally when you have to clean up the mess.
But I digress..lets try a real world example.
Once a upon a time, a shinning liberal city on a hill (well one with a natural harbor and not much of a hill) built the tallest buildings in the world. They were a symbol of liberal capitalism working together to generate wealth for everyone in the city. Then along came a conservative hero, lets call him Ronald Reagan, who wanted to slay the big bad commies in Afghanistan. But instead of taking them on, mano a mano, they funded conservative religious crazies to chop them to little bits. Then..another conservative hero, lets call him George HW Bush continued the policy and even did business with the family of one of the top conservative religious nuts, lets call him Osama Bin Laden.
Fast forward to the big bad evil villian, lets call him Bill Clinton. He said, that Osama Bin Laden was a badmother,,conservatives say "Shut your mouth"...
But he wants to attack America, says Clinton!
Conservatives say, Attack Iraq..they are the bad guys! And then..conservatives try to remove the villian Clinton from office.
The son of the old conservative hero, lets call him George W. without the H..Bush..assumes the throne. 8 months later...despite the warnings of the CIA, the villian Clinton and CNN..a plot to destroy the buildings the liberal city on the hill, succeeds! And lo and behold..it's the brother of a man that George W. Bush started a business with!! No way!
Those buildings took a decade to put up..and hours to knock down. They DID NOT get rebuilt during George W. Bush's administration.
The economy is sort of like that. Centuries to build up..and 8 short years to completely devastate.
Sorry chief..3 years ain't long enough to fix it. Especially when the very people that caused it to crash are working tooth and nail to make sure you don't.