Because the Majority who live there who wish they didnt cannot afford to just pack up and move somewhere else. They cannot afford to Take trips to different ares and states, research the areas, look for new jobs etc. AS THEY ARE TO BUSY WORKING TO PAY FOR THEIR bASIC STUFF AND UNABLE TO AFFORD TO DO LIKE I DID AND JUST PACKED MY CRAP IN A RENTAL TRUCK AND LEFT. I saved enough to be able to support myself for 1 year while I looked for another job etc.I also researched different areas of the country checking Cost of living, rents, jobs etc.
then i packed up moved to Central Texas Between Austin and Waco. The most economical and cost effective area in the United States when it comes to Cost of living, job availability etc.