yes maybe it could be good to hold for 10-15 years. but it's better when prices really seem high, as above $1,000, it is better to sell it. examples such as the year 2013, if you do not sell when it is, you might be quite regret, because until now the price is hard to reach $1,000 again.
Agree. While holding don't just hold. Make sure you are coping with the latest price rally. For example when the price will reached $1000, we can expect some massive dumps after this so be sure you are ready when that time came.