Actually, I know a great deal about the early church. Thanks for asking! It sure as heck wasn't run by ordained ministers...
Jim Jones? Talk about extremes.

You are right, anyone can call themselves a minister. A bit of paperwork, and you can do marriages. You can go to seminary, and still wind up assaulting alter boys. That doens't make that the standard, either.
There is nothing that makes a building special. Or a set of classes. The church is not about the politics, the facility. The power struggles are what have caused the prejudice, the wars, the reputation the church has in the eyes of non members. It is about the people.
As far as the Duggar's go, I believe there is just one bit of their home that is considered the church. The area with the industrial kitchen, rather than their home kitchen. You can't write off an entire home for a home church. Check the tax laws. Just like you can't write off your home as an office just because you run your business there. Or just believe what you like. You seem happier with that than with facts.
You use the same judgmental attitudes you blame on others. Is that something the Lutheran's teach, or did you come up with it on your own? I guess that I could take your attititude and assume that all Lutheran's are like that. But you know what they say about assuming.