A novel approach on starting house churches

Felicity Dale had an interesting post on ways to start a house church/simple church fellowship. Here are some of her ideas:

We have started several simple/organic churches over the years. Here are some of the things Tony and I have done:

We pulled together a group of not-yet-believing businessmen to study business principles using the Bible as our textbook. They all found the Lord--a church was born.
We started a kid's Bible club--on a Sunday morning so that we reached the kids from non-Christian families because the Christian families were in church. When some of the kids found the Lord, some of their parents asked to join in too.
I started a couple of churches in retirement centers. (I didn't use the word "church" when approaching the management). Fairly soon, they were led by the residents.
We have started several churches with our kids and their non-Christian friends.
A new-Ager was led to the Lord by a friend who asked us to follow up with her. She pulled a group of her friends together and they too became believers. Right from the start it was led by the new believer (who we mentored).
We followed Luke 10 principles to start a church in the low-income housing projects.
We have started church at work.

What do you notice it that list that is different from traditional church plants?

As she pointed out, most of them involve starting a new church with unbelievers rather than luring existing believers away from their current church.

What do you think of that? I like it, making disciples doesn't mean shifting current believers around, it means seeing new belivers come to Christ and become disciples. I do wonder if it makes sense to have a core of committed, more mature Christians who act as the catalyst. Other than that I am curious to hear your thoughts. This is something I have been noodling over for some time now.