Becoming VIP unlocks the ability to buy Stamina Resets. The higher the VIP level you become, the more times per day you will be able to refill your Stamina. Players have to actively purchase these refills.
These are not to be confused with the 3 Stamina Boosts that everyone receives at 12pm, 6pm & 9pm.
Everyone, regardless of Team Level or VIP level, receives 60 Stamina for each free Stamina Boost.