Djones every manufacturer includes a $2 power cord in the box to power their components. However many people have used high end after market power cords to glorious results. So should a company then have to spend hundred or thousands of dollars to include a high end cord with their product?
The reality is most manufacturers don't want to add additional costs to their products. Not to mention they might not want to be seen endorsing one particular brand of product.
If for example Audio Research started putting in a $500 Shunayata power cord or an AQ or Wireworld one, how much would that add to the cost of their product? What if the end consumer already was using a more expensive power cord and didn't like the brand that came with the product, that means that nice $500 power cord wouldn't be used and the end consumer would have paid extra for a product they didn't use.
Same things with vibration isolation devices there are a large number of companies that make these devices and some companies do use them, we used to sell Audio Aero CD players and they came with Black Diamond Racing footers.
Try some you might like them.
Dave and Troy
Audio Doctor NJ