Agree in general with the above. But here is the cynical side to my thinking, take it with a grain of salt.
If I was a principal of an audio manufacturing company, I would be keenly aware and give hard thought to the fact that for every part added to a product will bring a huge increase in price/profit.
For example, if it cost $1,000 to build a component (all in cost including parts, labor, depreciation, taxes, etc.) assume I could sell it for $10,000.
If I took the same product and added a new case and associated parts to separate the power supply for an additional cost of $500, I could sell the product for $15,000.
Heck, if I just added some better quality more expensive parts that I knew would not improve the sound quality of the component but know are the "darlings" of the audiophile world I would increase the component cost accordingly.
There is perhaps no better way to increase profitability.