That's basically the reason why there's spam, isn't it? The spams are meant
for the 1% or less who'll order from them.
Regarding your question about an "international coordination" to discussing
this, there is at least
one. (somewhat, anyway...)
US-based Internet marketers are facing a new dilemma: depending on the
DMCA and the FTC's ongoing "research", legitimate ones might eventually be
asked to keep a "do not email" list for those who successfully opted out of
their mailing lists. Imagine the nightmare of doing such aside from the already
damn growing amount of spam.