Depends on what you are doing with them. Value is determined by what the market will pay so;
A PHD is a soft category say English or Psychology if one can get a job between $23K - $35K max, Adjuncts make around $1300 per term per class times 3 classes a term. Plus your Barista job at Starbucks
Now a Masters in Electrical Engineering with an MBA you are way over $100K per year with minimal experience
“Better a true enemy than a false friend.”