I'm not entirely convinced that money laundering is unethical in its own right. Certainly, profiting from unethical activity is only once removed from unethical. That would make obfuscating the taint on unethical-once-removed funds an act that is unethical-twice-removed.
Clearly, there has to be some point at which we can no longer care, because I'm not certain that (metaphorically) there is a coin circulating that hasn't been dipped in blood at least once. Otherwise, the farmer who sells a hog to the butcher that sells sliced ham to the mafia capo's wife also shares the taint.
And even that presumes that the money to be laundered is profit from an unethical act, rather than one merely prohibited by government edict. I personally do not find marijuana-based commerce to be unethical. Therefore, I don't particularly feel as though a seller of sinsemilla on Silk Road should feel bad about wanting to be able to spend his profits without getting pinched, even if it means a murderer-for-hire could theoretically also prevent someone from following his money.
It isn't the money that's dirty or clean. It's the person holding it. Thus, I believe the criminalization of money laundering practices is simply an effort by the governments to solidify their control over the financial sectors, and to make their efforts at fighting crime less labor-intensive.
Even if all money were perfectly untraceable, police could still solve crimes by examining the evidence of the crime, rather than the evidence that someone got paid for it.
Of course, states seem to think that is rather a useful tool to have, so I expect that this business will be raided and shut down sooner or later. My advice is to cash out (in actual cash, no less) on the unexpected success as soon as possible, and then exit the business entirely before someone decides to make an example of it.