Well, it is, and yes, it can be use to keep your money away from the eyes of many. But I think it won't be a good idea to make money laundering for the sake of keeping your money being taxed by the government. It would just make you violate a law, though they can't find your money now, but for sure in the future they will.
If I become rich and wealthy here in BTC I wouldn't hide it I make sure it goes to charity or make a program that help poor people a dignity will arise to all of us bitcoin users and believers. If our profits is extra enough for our daily needs is better I shared it with someone else who's did not know yet about bitcoin currency.