Yes there is no substitute for hard work and if you successfully keep on working then you will surely get positive results out of it and I was unemployed for many months but after knowing bitcoins I am full time into it and earning a good living from it which was not possible without hard work.
All investments are risky and should be handled with care and same goes with bitcoin too as there is no guarantee that it will only bring positive results for us in future so its better to invest some part in bitcoins and rest in real world to avoid uncertainties in future.
That's true but their money works for them only if they have good amount of money and they are the people who have taken risk of investing their money and even I have seen many people who have failed to make good money even if they had good money to make an investments.