Well, there isn't any interest in it per se, but that is intrinsic to how fast we can make trades... Somebody offers the lowest sell price and somebody offers the highest buy price. The "value" constantly changes as those two highs and lows fluctuate based on who decides they'll sell for lower than the lowest offer or who decides they will buy for higher than the highest bid.
Unless you're saying that those offers/bids should only be accepted once/day and can't be changed until the next day? That's the only way I could forsee changing the quote once/day.
Send orders all day, clear them once a day. Calculate the resulting quote.
Let go of the illusion that the real value of companies change every nano second. The fact that stock exchanges close at night and that for 12 hours, values don't change proves that it is not a necessity.
Having 12 hours instead than a few seconds to think about the impact of a given news on the stock market is going to give room to breath for actual investors.
Do you know if the share of real GDP for the bottom 10% (or in general, bottom x%) of consumers grown? And is there a well-known term/metric for this?
However, he may be talking about pure trading, a.k.a speculation, which is very close to a zero-sum game. If you are not in for the dividends, yes, that's close to a casino where the banks who charge for transactions are the inevitable winners.
I wish we followed Warren Buffet's advice and forbid to sell a stock less than 6 month after buying it. I also don't see any interest in making the stock prices change every nano second. A quote a day can be enough if you are an investor, not a speculator.