I am not agree with you, you know bitcoin is a new way to make money, and now in that time everyone want to do investment or anything where they can make money and gain profit, and in that way , Bitcoin is really helpful way and at home we can do investment or trading and gain profit, So why not he use his all bitcoins in investment or trading?
Well different people have different views, some will prefer to spend them all as its a free money for them and some will prefer to invest them in order to get better benefits in future.
Obviously, i have seen people suggesting things which are totally out of my concept because if i personally get an amount like that i would probably like to increase them with the time and for that i would probably invest some of them in alt coin trading which i know can earn me good profits with the time.