Seems silly to do that. Branching into groups (NT's in general for example) works far better. If yeu have a large group of all the same type, eventually it's just going to degrade into blehness and "preaching to the choir", to the point that it's a waste of time.
Toss in that ENTP in general is semi rare, and with the lack of other NT's perspectives, and those of non-NT's, there's really no discussion possible.
In short, if I were stuck in a box with 20 clones of myself, I imagine the conversation would be rather dull. Even if the walls of the box were going to end up very colourful in the process.
Having 100+ people I don't know with different beliefs and such, would be far better sampling for discussion. Without a point of contention there can be no debate and no self improvement, soooo yeah. Lots more of those out here.
I have no interest in restricting myself to such an inane and dull existance, waste of my time, and I question why anyone else would do it in the first place.