Once the ICO/token sale is complete and the token is ready for launch, the issuer will aim to list their token on a cryptocurrency exchange where the token shall trade on a secondary market whose value is derived by the supply and demand for that token. If demand is high, the token price goes up and profit may be achieved, if low, the token price goes down. If your token is sold at a price above the pre-sale discount price on the SAFT a profit may be achieved when you sell your token. You will have to sell your tokens externally and independently on a cryptocurrency exchange.