Even if the amounts are small, especially if you play not for income but for entertainment, and still manage to keep a positive balance from gambling, I think that is already a win for the player. I have never set a goal to beat the casino, because I understand how difficult and, in many cases, pointless it is.
The house edge made it impossible for players to win the casino, and that's something we are not able to control. We have only one right as gamers, doing that which is in our power or capacity to maintain and manage, and forget winning for the house to decide. Mood is an example of the things we can control in gambling, and it makes the whole difference in determining how we feel about winning or losing to the casino. Leaving the house with a smile, is a huge win, notwithstanding the outcome of the day. Trying to defeat the casino is a step towards problem gambling, and consistent losses.