Ofcourse risky. Will you satisfy if btc goes up till 10k usd? How long do u think it ll take? Which one is better? Climbing from 1k usd to 10k usd in 5 years or climbing from 10 usd to 100 usd in 3 months? Check main altcoins dash xmr eth etc. they seems better with similar risk factor. Isnt it?
How come bitcoin investment is risky? If you are saying this because of the fluctuations of bitcoins price, then you are wrong. Bitcoins fluctuation price is just normal, what is not normal is if you are going to sell your bitcoins just because you are afraid that its price will continue to fall down, which is not, panic selling is not a must. What we have to do is relax and be patient until its price goes up in the moon again.
And there are more risk in Trading to be honest than investing your money into bitcoin, why? because you can't predict if this Altcoins that you are going to buy will last for a year, or will its price will goes up again, and so on, unlike in bitcoin, you are sure that in no time, its price will go up after its temporary dump.