Home is Where the Wins Are
It's the familiarity of being home that makes the difference. When you're home, the fans are cheering for you. You think when you're playing basketball all the time you're going 100%, but probably on the road, you're only going about 75%, but you think it's maximum.
And at home, something else...the crowd, the band. You walk out during introductions and you start perspiring...by the time you tip off, you're really ready to go.
I think the preparation you have at home for yourself is one of the biggest factors in explaining why you play better at home than on the road.