Anybody that feels he isn't supposed to lose, or (maybe because he wasn't informed prior to his trial) is as good as someone that sells, makes expenses and profit but doesn't calculate anything to know if they're running on a loss or not.

Having known this - just as undeniable as the fact that we're all gonna die - you're always gonna lose...hence, whatever loses you incure shouldn't bother us (that is, if it bothers you). Always remember to wager only what you can afford to lose.
Everybody feels regret for any single dime spent unwisely; The difference is that it doesn't show in a rich person's emotions/countenance.