Who would buy such a thing? Seems like an interested party might not like the idea that the TOS is so locked down (I'm presuming that the privacy is spelled out in a TOS, I haven't looked). Is a developed social graph really worth that much, especially if (as is mentioned in another thread) the groups are temporary, one-time use? I guess there's always the possibility of buying it and dispensing with the TOS and replacing it with a more open version.
Again, I'm just very curious. Having a hard time wrapping my head around this.