I agree with you. Fortunately, there are churches that are not so extravagant, and instead, spend their money to help the poor and needy.
The church I have grown up in is a simple church, and I am very proud that my church has always helped people. We have a food pantry, and we make special donations during Communion that is specifically set aside to help anyone who comes to the church with some special need. People in the area always know that my church is a place where they can go if they get into a situation where they need something.
Recently, however, our church has done some renovations. It's not fancy, but it does look nice. I think as long as we continue to have the means to help those who need help, it is ok to spend at least a certain amount of money in making the House of the Lord look nice. But then again, there's ALWAYS people who need help, and no matter what, we cannot afford to help them all. It seems it would be better to spend that money to help even one more person if we could, instead of having a new grand piano. But I guess it is important to have a nice piano so that people can praise God in song in tune, instead of out of tune!
So I guess it is a balance that has to be reached.
If a church is very fancy, then I expect it to also be one of the churches that is helping the poor of the community the most. If they are not, then they have totally misused their money.