Rob, they are "too smart" to understand what is being said. That's the only way I can explain it. People do win playing negative expectation games, and they do win on multiple days, multiple sessions. And when they quit when ahead they too can have a lifetime with a net win.
Little old ladies in casinos with buckets of quarters do this all the time. They know when to quit. You can hear them say it as they push the "cash out button" when they smile and announce "that's enough for the buffet."
What got us into the discussion about quitting when ahead came from our discussion, Rob, about your system for increasing denominations so that a win at a larger denomination can wipe out your losses at lower denominations. If they can't grab the concept that it is possible to "win" at a negative expectation game, they will never understand how your system allows you to win at a higher denomination to wipe out your previous losses and put some profit in your pocket.
I've used your strategy, but not formally. When I first started playing VP at the 25-cent level and found myself losing perhaps a hundred dollars, I would switch to playing dollars where a four of a kind would wipe out my losses at 25-cents. Did it always happen? No. But when it did happen, it was nice.
But as I played more and more over the years I found that quads are not that elusive.
But the bottom line, that our math friends still won't recognize, is that it is still gambling. You hope that the long term math works -- and there are many who will say it doesn't work for them because they are way behind in royals.
What is true and never changes is what's showing as wins and losses. Pocket the wins and you will never be a loser. As my father told me when he explained the stock market, "no one ever went broke selling at a profit." And the same is true in video poker: no one ever went broke cashing out a net win.