Essentially, it sounds like you're advocating a sloppy and lazy business plan. Quit your whining, enjoy your job, and instead of complaining about workers seek in this world, why don't you go enjoy a nice lunch somewhere?
Holy non-sequitor.
Not at all. It's been demonstrated that fast food restaurants can afford higher wages. They just have to be a successful business, such as In-n-Out. Of course, if you're less successful, or let's just plain say, "unsuccessful", you can still get your business to survive if you pay below a living wage.
If your food is of low quality, and your service sucks, you can't pack your restaurant at lunch time. Ergo, you're not selling to capacity, and your bottom line is not so good, so you have to pay low wages. That just about sums it up for most fast food restaurants.