I respectfully disagree that the proper progression system, used with basic stategy and control, is a losing approach. In fact, for an indivdual player, not on a card counting team, it may offer the most realistic chance of making money.
For years I used Dahl's Progression, which is the best positive progression system out there, in my opinion and experience. Now I have devised a negative progression control that I have added to it which has increased the effective progression even greater. I know many card counters disagree, but the progression approach has been the best for me.