Yes,holding of bitcoin is safe but I don't agree when yu said holding of bitcoin is not profitable cos holding is profitable. Are you saying some people that bought bitcoin when the incident of bitfinex happen don't make any profit now that the price of bitcoin is $625?
Correct. As for me, I see the event of an exchange being hacked (and Bitcoin's price decrease) an opportunity to buy more cheap Bitcoin. Usually, when this happens the price of Bitcoin recovers after a few days and then you can make a very nice profit. Also, holding your Bitcoins right now will turn out to become very profitable in the end once the price starts climbing towards the $1000 mark. It is best to keep your coins safe in a paper wallet or a hardware wallet such as Trezor for use as a virtual vault.
It is profitable but it is a long term investment and not like a daily income. Trading can be a good source of daily income if you are good at it but it is not a steady income too because you can do bad trades and there will be no income.
Trading can be one of those things that takes care of you, but it is a little like gambling, it can turn around and get you. If you absolutely depand on anything for income, then insure that it is a guaranteed thing.
Yeah its hard to expect steady income from trading, if you are good you may get regular profits but even though you can't be sure that you will be earning specific amount daily.