To Have A Network Or Not Have A Network?

[cots]

We are thinking of combining forces with another webmaster and creating a network of similar sites. The general principle is "Join One - Join All". I see a lot more of these networks with a similar option and it seems the way to go.

I can see pros - mainly it makes the membership offer more compelling/competitive - and cons - you lose potential cross sales. Of course there are more Pros and Cons than this but I have just highlighted the main one of each.

Personally I think it's a compelling argument to go down the network route but seek opinions here.

I know several of you have multiple sites but do not network them. Why is that?

It would be great to have a good discussion on this topic!