Tax the poor. If you drive down public roads, send your children to public school, use public transportation, and call on the police and fire dept in an emergency, then you need to pay something back.
Again, that seems like a fair idea. Unfortunately, you can get money from people who don't have it.
Portland, OR seems to be a haven for the homeless. You see them everywhere, camped out under the freeway overpasses, panhandling at the on and off ramps. One of the reasons given for this is because apartments and other rental housing is in short supply and thus high demand in Portland. This drives up the rental rates. Coupled with this, Portland lacks sufficient homeless shelters.
Are these the poor you are referring to when you suggest everyone should pay their way? How do you propose collecting taxes from them? Perhaps the tax man could crash the emergency room at various local hospitals when these folks show up for treatment they will never be able to pay for.