500%? No one I guess, most people will take 100% profit from initial capital, moreover if someone could obtain more than that.
Because bitcoin prices like bubbles which mean it always fluctuate, after reach highest peak, its price will fall down to uncertain point.
That's why, selling bitcoin in order to get profit is a good choice, and we can buy back after bitcoin drop back.
But, I do not recommend to sell all of your bitcoins at once, because there is possibility the price will continue to rise.