first, kill all the lawyers...
Dunno. Seems to me that putting pockets behind Metasploit not be a good idea. Particularly not a security company's pockets.
Unlike Snort, Metasploit is an intrusive tool.
Seems to me that the first time some script kiddie starts poking around some company that uses logging with Metasploit and a few weeks later a Nexpose sales call comes in, an argument could be made that Rapid7 is deliberately beefing up Metasploit to drive sales of its security consultancy.