Nit: the explanation of Cantor’s diagonal argument is incorrect. The actual proof starts by assuming for contradiction that all of the reals can be enumerated.
Your version only shows that rationals are a strict subset of the reals, which is much weaker than showing that the cardinality of the rationals is less than the cardinality of the reals (by analogy, imagine the Natural numbers and the Natural numbers plus {0}. These have the same cardinality by the map x |-> x-1, but one strictly contains the other)
price ratio from fine dining+private chef to prepack+fast food is ~1.5oom. Same for the price difference between annual new iPhone (~$1000/yr) and pentannual used Android (~$30/yr).
Most of these product categories you list seem to either be around this amount of variance, or luxury goods where the pricetag is the thing you pay for.
The biggest exceptions I see would be private jets, exclusive actually VIP concert stuff, lobbying, etc. And it seems that those types of goods which are inherently scarce, rather than industrializable like iPhones, have such ridiculous prices because lots of extremely wealthy wallets are chasing a small supply. (Private jets might be the exception? I suspect the same dynamic works there but I can’t fully work out the details in my head)