There's a lot of failure to appreciate a simple fact:
"1 share" is not a consistent, well-defined unit. It's just some arbitrary fraction of the value of a company, that fraction varying not only between companies but also over time, because of splits, secondary offerings, and buybacks. This seems like an obvious, straightforward fact that everybody knows, and yet historically, there has been a tendency to ignore it and to think the price of "a share" means something. Companies whose share prices are above $50 or so have been viewed as "blue chip"; those below $10 have been viewed as "speculative". There is thus a psychological component to the perception of share prices that is not justified by the mathematics of the situation; and much of this is a matter of convention. Even today, I believe that to continue to be listed on the NYSE or even NASDAQ, a company must not let its share price fall much under $1. The only effect of AMZN trading at $1730 is to make it difficult for small traders to trade the stock, since exchanges don't deal in fractional shares (they could, I suppose, but they don't).
We see this error in the way that Charles Dow and Edward Jones defined their index back in 1896 [0]. Averaging prices of shares in different companies is mathematically meaningless. But the author of this piece, having commented on this error, goes on to make it again: For example, for fiscal year 2017, Costco had earnings per share of $6.08. Amazon had earnings per share of $6.15. Costco’s market value is $91 billion; Amazon’s is $844 billion. EPS numbers aren't directly comparable any more than share prices are directly comparable. COST is trading around $209, less than 1/8 AMZN. Instead of EPS, we should be talking about earnings per dollar of market cap, which would be independent of the size of a share. On that measure, COST is outperforming AMZN by a factor of more than 8. (Along with juxtaposing EPS numbers from two different companies, the author seems to be committing a second error by suggesting that earnings and market cap should be related; they are not, at least not in any simple way.)