I have bought about 4 bitcoins and now have a plan to hold them for next 4-5 years and i would also advice that you can also invest in bitcoins.
You dont need to trade with them,just buy and hold them.
4 bitcoin is even not a good amount to hold for long time but the price of bitcoin is in which is increasing too much that it is making it more difficult for the people to buy good amount of bitcoin. I think those people who can manage to sell even their useless stuff that are free from you to buy bitcoin it will be more profitable in long term. I sold my heavy bike for buying bitcoin, I am still managing to buy more an more bitcoin and hold it for a long time for getting good profit.
You gave me a very interesting idea. I also have many things that can be sold. But I never thought about it. They just lie. But they could bring me money.
I'm sure that it is not too late to invest in bitcoin and sometimes I buy coins