You're seriously comparing rape/murder to selling forum accounts?
Exactly. Don't forget CP too. When selling forum accounts becomes against the law we may rethink the policy, but currently it's not.
A very wise (may be) person has already argued and compared these two things:
Selling a "trusted" paypal account is certainly not a crime. Many things are used for money laundering and illegal things. I hear knifes are dangerous killing instruments, yet people use them daily to butter their bread. Dont jump to conclusions, I cant speak for paypal, but most bitcointalk account sales probably happen for paid signatures.
Rules are rules just as laws of a country. If one doesn't follow them, they basically are fraudulent people/criminals/psychos. But saying that rules/laws shouldn't be implemented because it will take place in the private/outside the country is completely illogical.