> Telephone numbers and drop-boxes can be and are routinely connected
to the people responsible.
The success rate is not that high, the cost of the investigation
is high, unless you know the exact time the person is going to
collect the info the cost of a stakeout is prohibitive.
Even a number of the high-profile ebay fraud arrests depending on
serious detective work by people who had gotten nailed. In at least
once case all the police did was show up to make the arrest. It's
hard to find people willing to put that much effort into tracking
down a spammer.