This is true. Sometimes I hire minimum wage workers for clean up when doing a roof. But I end up paying them more USUALLY. You know why? Just what you said. Value.
When a roof job is going on, all the neighbors in that area are watching. And if they need a roof, they are watching closely. And if that minimum wage clean up guy is doing a real good job keeping the mess cleaned up, that's a good thing.
You know why? The neighbors love it when the job is done right. And cleanly. And the neighbors will come up and either ask for a business card and an estimate or they say how good the job looks.
But the interest in a roof is not based on what I pay the guys shingling. It's based on the lowest paid worker I have. The ground clean up guy. Now that is adding value and is worth more than minimum wage and I pay more than minimum wage. Usually.
Ain't that weird?
That is all well and good, but running a business has no attachment to how the neighbors feel, nor does it have any social prerequisites.
A business operates to provide a steady and increasing income to the owner(s) by providing a product or service to consumers who cannot or will not provide that product and/or service for themselves.
To product this produce or provide this product for consumption, the business employes people with skill sets that fit specific Business Intelligent models for each department. An HR skill set for managing the people, a Purchasing/Warehousing skill set for acquiring the raw materials or needed products for resale. An Accounting skill set for managing and maintaining the financial health of the business. A production skill set if the business creates products from raw materials to a finished product. A Customer Relations unit for understanding and interacting with the customer base.
All of these are marketable skill sets that bring with them a value. A janitor does not have the knowledge to handle business investments in equipment needed, financial vehicles to earn and safeguard wealth, nor balance the accounts of the business. Therefore, he is undeserving of the 65 to 70k dollars a year salary. He is responsible for keeping the toilets clean, the trash emptied, and the floors clean, which is deserving of the 8 to 10 dollars an hour he or she earns.
So, a discussion on what is the minimum wage acceptable is not a worthwhile discussion to have because it is devoid of the value that the wage earner brings to the relationship.
If the janitor wishes to make the 70k dollars a year, he or she needs to gain and master the skills that will meet the requirements of the accountant.
If the janitor finds that they cannot live on the wage they earn, they (and only they) are responsible for increasing their value to a prospective employer.
Society has and should not have, anything to do with it.