Do whatever you want man, there are so many things you can do. Buy, Sell, Hold, Trade and much more all under the same roof of bitcoin. It is unique concept and gives you versatile ways of spending or even earning it.
LOL that's right he can do whatever he wants to do with his coins after all its his coins either he can hold or invest in trading and try to grow them in future and if cannot afford to take risk then simply keep them safe in wallet and wait for the right price to sell his bitcoins.