In Europe and America, orange is commonly associated with amusement, the unconventional, extroverts, fire, activity, danger, taste and aroma, the autumn season, and Protestantism. In Asia, it is an important symbolic colour of Buddhism and Hinduism.Satoshi was fond of the word "Karma" in his pennings, ergo the color orange becomes an even better fit. I wonder if bitorange.com is available.

Yes, Asia represents over 2/3rds of the world population. We shouldn't allow provincial biases to get in the way of a global currency.
There is also the practical aspects that logo designs for the web should use web friendly html colors... which limits the choice between -
goldenrod #DAA520 rgb(218,165,32)
gold #FFD700 rgb(255,215,0)
orange #FFA500 rgb(255,165,0)
darkorange #FF8C00 rgb(255,140,0)
There are technical reasons that come into play with color choice.