I don't know what's more disgusting, the fact that they openly demand money or the fact that the JWs don't SEE how disgraceful this is anymore.
My mother made a big contribution once (before I controlled the money).
A couple of years ago she was asked to make another large contribution. I told the brothers "a few years ago she made a large contribution and that's all that's going to happen, she needs to keep her money. I need it to care for her." Uncomfortable silence followed, but after that they haven't asked again.