Selling is not a good thing and another fact is that with selling you are just making a little bit of profit, you can better wait on better prices to sell your bitcoin for.
Also the fact that the bitcoin can become the currency of the future makes it for me pretty simple that we should hold it.
By holding it, you have a good chance to make good profit in the future but never selling it does not make sense. We have to sell our bitcoins by should be on the right timing and that right timing is when we are making profit when we sell. The future is good so we should put a decent amount of investment if we wanted to make a decent profit as well.