Of course if you will be positive Bitcoin will make you rich in the future. But in reality, when can never say what the future of Bitcoin will be. It might spike up, but it might also fall down. The demand of the people today is rising but it will have a downfall time somewhere in the future. In my opinion, we hold the Bitcoin but still manage it in order to mimize the risk of of loosing our money. There are a lot of ther investments that we can diversify our money on.
Yeah one should never sell bit coins ever as bit coins are the most secured and exponentially growing currency. May be you are not getting any profit on them these days but you might be getting larger profits in the coming future when bit coins will be ruling the world, but you have to hold on for the next 10-20 years.
Its a good idea, but holding too much bitcoin its to risk, much better if you sell your bitcoin . When you are making a profit, but you need to make a better plan and when the time comes that see your desired price then you should sell it. Dont too much greedy if you dont want to end up losing or having a small profit.