If you have extra money it is good to invest in bitcoin because it is most popular and most profitable currency. Through this it is very fruitful for you if you want to invest now because prices are going high. For this you will take a risk but a business saying high risk high return so its the time to take a smart decision for investment.
I agree with you. We should to think carefully before put money on it. I think you should invest 20%-30% your fund only
The way things work for everyone is totally different which is based on their responsibilities. Lots of people do not have much responsibilities and still very young. If they feel they believe in the future of bitcoin and they are ready to leave their earnings or savings there, I don't see a reason why they should not.
It is a high risk but can really help them to build their dreams later on when things work right. After all, youngsters are always fund of spending anyhow, so this might be a chance for them to learn how to save.