I say judge them by their works in the community, not the size of the church.
Remember, you are talking about a church of 20,000 people. This is the equivalent of a $250,000 church for a congregation of 100. I don’t know what real estate prices are like in Chicago, but it seems a reasonable price to me.
Don’t forget, they didn’t move to the suburbs to create this place, they stayed with their congregation in the inner city. Those basketball courts can help keep neighborhood kids off the streets.
I have worshipped in all sizes of churches from 50 people to the one I am in now, which has 2,000 congregants. There are some advantages to larger churches, the one that affected me was a support group for those who have gone through divorce. Not too many smaller churches can support those type of groups, since they have fewer people in those type of situations.
The kids in larger churches benefit from having more kids their own age participating. I remember being one of 3 kids in a Sunday School class in a small church, it wasn’t too good.
Someone mentioned having police directing traffic outside the church. Really, this is a service to the community. The church pays the police their overtime, and the community doesn’t have to deal with a worse traffic jam.
You might think that a large church is more impersonal. It depends on the church. If you want impersonal, sure it’s easy to get. But if you want the personal you can join any of the small groups or bible studies, and get to know people on a one-to-one basis.
If they went from 700 to 22,000 people in just 15 years, they must be doing something right. Hopefully, this is not just a cult of personality, and that all of the credit is being given to God. But again, judge them by their works and not by their size.