"I've spent a long time trying to explain to Stack WHY this happens,"
Speaking of Delusions of Grandeur, almost every paperback gaming book (some from the 1960s) has a section simply explaining the "house edge" as the difference between what the house pays off on a bet and true odds. For every $1,000,000 in wagers, the house should keep $50,000 with a 5% house edge.
Do you really think a player who walks from a Craps table with $9500 profit wants to hear your opinion why they should have $500 more and what you expect them to do in a lifetime worth of play based on your book smarts and calculations?
Congratulations, you can calculate how much the house should expect to keep after $10 million in bets.
Good luck playing No Limit Texas Hold'em after studying all the Poker probabilities. The thing I can't understand, if you can learn that much from books, why does a member of the Pro Poker Hall of Fame say about Hold'em, "It takes five minutes to learn but a lifetime to master."?