Yes.  The amount that you hold depends upon your view of bitcoin, your time horizon and your various other investments, if any.

I don't generally provide specifics of my holdings; however, when I started in bitcoin in November 2013, my goal was to attempt to accumulate at least 30 bitcoin in a 6 to 12 month period.. and I was totally planning to use money to invest in bitcoin that I would set aside completely for bitcoin and that I would not need for my regular living expenses.  My plan was to invest in bitcoin for at least a couple of years, and to learn about bitcoin while I was investing and then to reconsider and evaluate my position from time to time to consider whether I wanted to stay investing in bitcoin. 

I continued to accumulate bitcoins through most of 2014 and 2015, and until October 2015, I never sold any bitcoin because whenever I sold bitcoins, I would immediately replace the bitcoins within usually less than 24 hours.

Starting in October 2015, I began to trade bitcoins, but only a small portion of my holdings, so I even though I continue to sell between October 2015 and present I continue to buy back and attempt to accumulate more bitcoins and to bring down my average price per btc..