Do you know many people working a second job to pay a few bills??? Sounds like they are not going to be there long and that hurts many companies because pretending it is so simple a job anyone can hit the ground running is foolish.
Corporations want people to make working at there business/store to be the workers top priority. True some workers are still students but more and more businesses like Walmart and Target are shifting from part time mommies, students, and short term workers to more stable long term workers.
People on the right are stupid enough to believe all those NOW HIRING signs don't exist, and continuing to pay dirt wages is a benefit to workers. Those Help Wanted signs are out there because people, even 'kids' don't see 7.25/hr a fair wage...