Judging the value is also about how many people could do the job. A job that can be done by lots of people because it isn't very skilled or doesn't require specialist knowledge is less valuable in that respect thatn one that can be done by fewer people. Compare, for instance, being a GP with being the cleaner at the GP surgery.
No, I'm not saying the cleaning job is less valuable when it comes to the sense of pride in one's work that the cleaner might have, only that it needs fewer qualifications.
For all I know warehouseworkers moght need more qualifications (like driving pallet picker uppers) than a shop shelf filler.
As I said, it'll be interesting to see how the case pans out.
I've got another 'keen'... Ouch!