You asked these questions in a different thread to @hedgehog, but I’ll answer them here. 
Reasons:
- it’s growing like crazy
- it’s a privacy-wise improvement to electronic payments
- the government doesn’t need to know you hold some
Other crypto:
- Yes, more is better. I hold currently BTC, ETH, LTC, but I’m planning to expand.
Portion of portfolio:
- No, it’s peanuts (1-2%) - combined with my gold coins, it’s 5%.
How to buy:
- Currently, I use Coinbase, but it has limited coins. I’ll open soon an account on some exchange that supports more cryptocoins, so that I can buy different ones. Not sure which one is best for that though.
How to store bitcoin that it’s safe:
- Hardware wallet with backup. For example, I asked my family to buy me for Christmas this one:
Ledger Nano S Plus | Ledger (Yes, it supports storing multiple kinds of coins)
How would you interpret the current $4000 price, do you think it is still undervalued in the long term?
- No idea, initially I thought it’s a bubble and it will go to $10 sooner or later. But now when I see people using it, when I started using it for online transactions, when I see the number of crypto-companies in Zug, I started thinking that it’s undervalued in long term.
And finally, any other significant investments than the stock market and crypto?
- Yes, gold, silver, platinium, palladium. I think diversification is a key and in the future I’ll expand more into hard assets - land, real estate, forests, farms. Maybe some classic art in the future or whisky. I plan to keep 90% in a standard passive, index, world stocks-bonds portfolio and 10% in different kinds of alternative investments (5% risk ones, 5% hard assets). Maybe one day, I’ll sell coins and invest into private equity. I think it makes sense to diversify into other classes of assets and get some more risk in small fraction of the portfolio. The hard assets are for the III Wolrd War scenario - their performance is usually miserable, but they are really safe and long-term store of value.