Usually people like to associate with success and failure doesn't have supporters 
. People don't want to labour to see the fruit of the labour in the future, they would rather expect that they see it now but, they are wrong. Yes, cryptocurrency has potential to enrich adopters in the future, so whoever that doesn't believe in the future might likely not be a participant to this great opportunity.
Your friends want money but don't want to be patient for it. As you said, they are likely going to be envious when you start crushing on lambo....
That is usually the problem. Nothing good comes easy and you have to work for anything you want to have. I can see now why scams, drugs, and so many other things are rampant globally as most people these days are looking for the quickest ways to get rich and really do not always consider the idea of paying their dues and that is terribly wrong. . People don't want to labour to see the fruit of the labour in the future, they would rather expect that they see it now but, they are wrong. Yes, cryptocurrency has potential to enrich adopters in the future, so whoever that doesn't believe in the future might likely not be a participant to this great opportunity. Your friends want money but don't want to be patient for it. As you said, they are likely going to be envious when you start crushing on lambo....
It is better he did tell them, as at least they will not have any excuse to blame him for their own predicament later in the future when he is indeed crushing that lambo.