Cost down is one reason. Allows for forum vacations. Like breaks from the forum. Sometime 2 or 3 heads are better than one. The fact that 2 or more people with the same idea are not trying to get the same people to each site. You only have 1 site instead of 2 or more.What would be the benefit of having two owners? To keep costs down?
Of course there are down sides to everything.







