It probably wouldn't help the player much anyways, at least not to increase the bankroll at the rate people want to increase it.  Would help to stay even over long periods of time flat betting, and give more life to systems.  0% edge is not a window to unlimited profits, and it would be hard to convince investors in purely gambler's ruins casino, where the bank has more money than the player and therefore has an advantage.  Plus a player can come in with more money than a casino as well.