Just don't help them financially. They will still apportion some for the WWW no matter how poor they are. They need to learn to prioritize.
There are those who are unemployed that will put something in the contribution box, thinking that they are seeking the kingdom and the rest will be provided. My theory is that they are going to the meetings and contributing, then why would Jesus help them, they are already doing those things. Stop doing those things because of lack of money and then he provides.