BTC is expensive for 1 BTC yes but then buy 0.1 instead? I have 0.2 and it around 5% of my portfolio. But I am fine with it and I bought it when price for 1 BTC was around $4,000 so that is still great gains from that purchase. Transaction fees are high for transferring for low amounts of BTC, but you should just buy and hold and then we are talking about one transaction fee.