I agree the articles I posted might be slanted. However, even for the uninsured people who enter the hospitals, at least they are citizens of the US and are hopefully contributing taxes somewhere.
The article posted above appears to be reporting on immigrants, not illegal immigrants. Let's keep looking though, you've got my curiousity up! I think you are right about big business - these people are not going anywhere anytime soon.
Here's an interesting site that discusses both legal and illegal immigrants...
http://www.fairus.org/