Some clarifications
1. I was not describing pastoral behavior in talking about poverty, outcasts, common purse, etc. I was describing a radical counter-cultural vision of the makeup of church that I believe is consistent with Jesus' social message. These aren't attributes of the pastor. They are everyone. I also have in mind Steve's talk "Toward a Radically Christian Counter-culture."
2. I am taking a pragmatic approach. I'm being post-modern in my approach to the bible on this subject. Different readers can come up with equal justification for their interpretation of the Bible's model for church, each claiming their own to be the purest. My approach is to ask the question from a different vantage point: "which model best facilitates Jesus' social and counter-cultural agenda." I think plurality of elders, perhaps with a first-among-equals elder is the most capable of leading this type of church.
I believe that church in a home is the Biblical pattern,
Not necessarily. We don't know enough about the first century church to make that a certainty. And just because that was how it was in its fledgling form, does not mean that it would be wrong, as I've said, to grow your model with your growth. Why would the 1st century churches lead their meetings in homes, if they grew beyond the size of the home?
and that having a building, where you can count how many seats there are, greatly increases the problems that the body of Christ faces.
It increases certain problems. Budgets for one thing. And what we call the carpet-color controversies. Churches become divided about the darnedest things. I think I've heard said that pastors rarely survive building projects. I have a pastor friend who says that the worse thing they did was construct a building. They couldn't keep up with the growth. And it wasn't ego. But when they constructed the building, the growth slowed down. People stopped focusing on outreach.
Pastors who crave great authority want ...
Pastors who crave authority don't need auditoriums. The shepherding movement was full of men having authority of others in very small churches. People with authority complexes will get them wherever they are, regardless of congregational size.
And plurality of elders helps avoid this problem. Someone who craves authority, will be met with godly men who will hopefully call him on it.
I don't think that the church has to be small to be faithful. And I don't think counting noses, in the instance of doing church is necessarily evil. If I have a room that seats 100, and we start with 50, and know that the people who we added were genuine new Christians, and we ran out of room, then we should push out a wall. If that room that now seats 200 becomes full, and we have good reason that the growth is through genuine reproduction of the Jesus way, then we need more room. While we could idealistically say that the church should be able to multiply, rather than grow by reproducing leaders, revival-ish growth inevitably overwhelms the ability of the leaders to raise up more. This was true in the Jesus movement.