Just based on experience minimum wage should be raised but only a small bit but based on service there should be an alternative minumum wage that progresses to a "livable wage" based on hours and term of service. For example if you work 20hr weeks for a year (approx. 1040 hours) there should be a mandate that your new minimum wage is 5% higher, if you are a full-time employee working 40 hours per week maybe a 10% raise until you reach a cap of 30% over minimum wage. This would provide incentive to an employee who does gain experience (and typically speed/expertise provides the employer a higher productivity value as well) to stay with the same employer and not constantly jump from job to job.
Full time: 0-1yrs, $9.50hr
1-2yrs, $10.45hr
2-3yrs, $11.50hr
3-4yrs, $12.65hr
In the example above, the employees have a livable wage within a few years of employement and an incentive to stay with their current employer. The only downside is that there are many employers who would simple look to make an employee's work life difficult to force them to quit if they do not value the employee enoguh to support the extra couple $$$ per hour.
When people work in minimum wage jobs they generally have little to no financial incentive to work harder because there are a lot of available jobs that are usually easy to get. If an employer pays slightly above the norm, or provides good raises to the employees that perform they typically stay and provide enhanced value to an employer which in return should enable the employee to enjoy some of the return. Many minimum wage employeers have ZERO incentive to give any raises because there is a very large pool of labor just waiting for a job resulting in little or no business impact if an employee leaves.
Locally, typical retailers (NOT WAL-MART) pay $11-$15/hr here. My daugher, a junior in college, just took a brand new part time job at close to $14/hr at a retail clothing store. The reason the employer pays so well, they want more driven employees willing to work a bit harder and provide a much more stable work force than most. It is increadibly hard to get a job at her store, with close to 300 employees they turn over close to 30 a year or less on average they can be very selective when hiring.