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?
yes i think that you should, bitcoin have huge potential, i think it will be really popular and important in future, and don't forget about halving that will happen in 2016 July, it will halve block reward for every block mined so price should rise, and in worst case if price won't rise at all you can sell them back for fiat without any large loses
Money can be invested not only in bitcoin and if you will find better idea, do this. But bitcoin is really good for long term investment and also it's stable thing.
Yes bitcoin is really good for long time investment because of its price is steadily growing and with it your money is also growing day by day.
It is true tho, it has been going up fairly steadily, and it looks like a strong investment right now.