Putting aside that there are a finite number of Bitcoins that will ever be mined, what good is that? You'd have "untainted" coins that you could hardly even spend without immediately tainting them because six degrees of Kevin Bacon means that everybody else's wallet has already interacted with the unclean.

> And it's not even strictly adhered to, because some bitcoins are already more valuable than others.

Is it the tainted ones that are the more valuable ones because you can still exchange them for the same number of dollars but they also have additional value for trolling people by sending trivial amounts of them to their untainted wallets without their permission?