Part of the problem is that "worth" and "value" are very subjective terms which underscore the phrase, "
You get what you pay for." We've already got plenty of examples of this with your car analogy.
In our household we do own a more expensive Audi which in my opinion is over priced for what you get. It has 4 wheels that gets you from point A to Point B. My much cheaper Murano does the same thing and is actually much more comfortable to drive and hauls more junk in the trunk.
And I for one don't think it's expensive to buy a bucket of H2Ocean while everyone who uses IO will think it's ridiculously expensive. Meanwhile, I went to Starbucks rather than Tim Hortons for a coffee today. Did I get what I paid for? Well, I paid $5 for a coffee and I got a
$5 coffee, so I guess I got what I paid for
Bottom line, yes, you get what you pay for, and no, you don't get what you pay for.