1. Borrowing money to invest
2. Greedy expectations in reward
3. Total reliance of people's opinion. Among many others.
My emphasy is the third. It is good to listen to people opinions but not all opinion counts. Many here just make confident predictions that has no base, go to prediction topics in our bitcointalk to confirm this.and you know how painful it is when you lose just on someones prediction. It is better you follow your mind during investment and bear the consequencies thereafter.
1. I don't think it's an issue borrowing money to invest in trading or any project. That's if one knows what one is doing. However, my caveat here is that no one should get a loan from the bank to invest. Borrowing from friends or relatives is better than going to the loan sharks. I have my reasons for this.
2. Human wants are insatiable. So, I don't think any reward expectations are greedy. After all, what is much to one may be less to another. But I like taking profit above X 10 on my investments.
3. This third item is subject to different individual expectations and I solely believe that it's for that reason that we all have mentors in life. Mentors are those whose ways of life and business modules we imitate. "It is better you follow your mind during investment and bear the consequencies thereafter." While I understand what you meant by the bolded, I strongly caution that same wasn't for noob investors or traders. There's always a learning process. No one was born an expert. We grow by learning from others — and from our mistakes too.