I have 10k $ and maybe going to buy , but I doubt the further development of Bitcoin and I'm afraid to lose money! Can you convince me or dissuaded from buying?
You don't need to have a doubt in bitcoin actually. In fact, there are more businessman or other investors who put there investment into bitcoin more than the amount you have now, so what makes you different with them. Only things is they never doubt on it instead, they are totally believed in bitcoin itself.
Different people thinks differently and have different perception about bitcoin and people who have faith in the potential of bitcoins will not hesitate in investing huge amount of money into it as they are pretty confident that bitcoin will survive long and will give best returns if they wait for the right time to sell bitcoins and a person who is afraid of investing will never experience what profits is all about.