Do we really need bitcoin?
Yes, I need it. With bitcoin I can work and trade with people all over the world. I never thought in my life that I would experience working overseas without having to go abroad thanks to bitcoin. This shows that bitcoin is not just for investment.
Bitcoin is a form of gamblmg that if you are new you can have high chances to lose money and that benefits others as it comes to them as profits right?
No, bitcoin is not a form of gambling. Bitcoin is a thing, gambling is an activity. Bitcoin is just a more flexible substitute for fiat money. Even though bitcoin was never created, you would still think of objects that have value and fluctuate as a form of gambling.
You may mean that trading is a form of gambling, but I would also say no.