I came here to post this, so yeah, not much to add.
But on some there would be no problem. PIVX has decent liquidity for example, I think you could dump, but yeah it would be less than that since buy orders would keep getting filled so the price would tank. So you should sell daily in smaller amounts to not crash the price.
Anyway those are some great gains.
POSW can give great gains in the future, im holding some. You never know when those alts are a year from now. You have to take some risks by buying the super cheap coins that have some sort of niche purpose and hope for the pump.