I will not use all of my money or taking a loan, there's no one can be trusted except yourself. Human creature is greedy, no one will tell someone including their family if they can make a lot money in short time/easy.
I highly doubt it. But if let say it's possible, I think I will still trust Bitcoin because the coin never fails me before. Though I will observed its latest performances. If something shady comes in, I might slowly pack my bags.
I think being greedy is different from being selfish. There's actually people who will encourage others to join them even for the good stuffs. It's fine if you will not use all your money. I understand that not all are confident when it comes to these matters. I can in fact do the same thing. I will still be happy and thankful if my earnings are only small.