"A shareholder would have gained $38(less commission) for each 10000 shares sold today"
That's true. If they started the day with $1800 worth of shares (10,000) and held or sold them at the closing price they would have been worth $1838. Sounds pretty cheesy. A lousy 2.14% return.
But if they could get that same cheesy return every day for a year, taking investment plus gain and reinvesting it at the end of each of the 252 trading days in the typical non-leap year, they'd have a neat little holding worth $373,789.93 at the end of a single year. And the gain alone on day 252 would be about 4 times their original investment. Not so cheesy. There would be commissions and taxes to worry about, of course.
Doesn't sound right, does it? Is it?
I know it's neither realistic nor applicable.