I have had several business dealings with "brothers" and I will never do it again. There just seems to be a bigger degree of dishonesty among them than normal business. You would think it would be different.
I know several people who have talents, perhaps mechanical, construction, and such. Many cases of where other people in the congregation felt that because they were in the hall they deserved free work.
My own father in law lost thousands and thousands because the "brothers" automatically thought it would be ok to pay him some time down the road. It never happened.