This has so many great posibilities. I would drop my special and strength and raise luck to make me win the lotery at least once.
Also having more stamina could allow me to raise my strength in the gym and use that for even more increased stats.
If i were to lower my stamina i could raise it again by running every single time. It's a infinite points exploit !
Even if it takes a while you can also increase your life span !
BTW, was that's why Marumoto-chan died ? Cuz her lifespan was shortened ?