We live in a planet-size, and beyond, field of energy. Someone who tries to "win" is like someone swimming in the ocean and trying to get as much water for themselves as possible.
If you're using psychic energy correctly there is ALWAYS enough.
Think of those typical quotes about sharing: giving a smile is always free, or lighting a candle from another candle doesn't take anything away from that first candle light.
Psychic energy is not some thing "out there", or something you really have to learn; psychic energy is always available, it is our minds that need to quiet in order to sense it and use it. A person fighting or struggling over energy is a direct indication that that person needs to let go of the anger or competition and remain calm.