Of course, with $ 10,000 there are many options for you. If I were you I would invest in ETH, XRP, XLM, TRX, EOS. Every Altcoin which I would buy $ 2,000. Because why I didn't choose Bitcoin. Bitcoin price is high and you can't buy much while the Altcoins are cheap and there is great potential. If after 2 years Bitcoin goes up, the Altcoins I have bought will also increase with no small number.
Now, it is a great risk to invest much in the cryptocurrencies. The market is not stable, and you can lose. Simply take a couple of thousand to buy the best altcoins, Ethereum and TRON, and the rest invest in some business.
I think as long he using his idle money, i think its fine. With $10k, we can collecting a lot coin or token in market because the price very cheap compare end 2017 or ealy 2018. But i am agree that we can divide it to real bussiness