Some churches have modest or even shabby buildings, and use the money to help out needy people by way of representing Jesus Christ, and/or for more direct evangelism outreaches. Not all flavors of Christian congregations agree that all approaches are proper and will spend hours arguing about it sometimes, but it’s not necessarily “to maintain a pretty building.” If you wonder what a particular church congregation is using their offerings for, ask it. Most will be tickled to show you.
I didn’t mean to impugn all churches with my comment about church buildings. However, some spend nearly everything they take in on themselves. As I type, there are Christians who are being oppressed, even murdered, for Christ, and there are also billions of unbelievers at risk of eternal damnation. I’m not saying it’s wrong to worship in a comfortable building. One should do what Christ directs them to do, to the best of their ability. That includes even tithing 10% to build a nice church if that is how they are led. The challenge to do what Christ wants applies to me, too.