I dont know what you guys are talking about, xrumer services are sold all over the web, you can see threads at warrior forum, sitepoint, wicked fire, v7n, BHW selling those services.
Just because it is being sold all over the web, dosent mean that it is ehtical. You have to understand that when you exploit other companies with intent to gain better rankings on google knowing full well that people are spending alot of money to stop this sort of behavior that there will be unhappy people out there and ramifications for these sorts of rorts. Nothing would make me happier than seeing a company like xrumer being made liable for clean up fees where they are in breach or Terms of use of various websites. Accountability is an issue for me, there realy isnt any online right now.
If you see it advertised on v7n... Hit the report button there, cause it is against the guidelines there to advertise forum spammer software or services, and xrumer is prohibited by name. Forum spam software not only wastes the time of owners admins and mods... It also wastes the money of the goofball that pays for the services in the forums where a link is meaningful. Those tend to put good hurdles in place ( xrumer is not as unbeatable as the sellers say)... And tend to have the technology to do serious cleanup on any that slip thru.