If you have a lot of resources and have enough money to compensate your needs.. then selling your Bitcoins is not an really option. You should invest with your Bitcoins rather than selling. Just my thoughts.

This is true but I think that on a day you have to sell it because otherwise the profit is most likely minimum investing with the bitcoin in something is also doubling your risks if you are asking me.
If you dont sell bitcoin you will not gaining the profit you should sell it the only you invest is patience and increases of the price. but it takes a long time before we can see huge price increase for bitcoin its not the same right now because bitcoin has a big chance to go huge increase if many investors are invested in bitcoin its growing day by day.. and i think many people are always waiting for 700 value that can possible to happen before end of this year..
$700 price is likely to achieve in next couple of months and I am sure many of them will prefer to sell their coins when it hits that price and I think that is the right decision to make.