For me, financial freedom inspires me to invest in Bitcoin. When I realised that holding Bitcoin means it's my own bank and I can spend it whenever I want, I started playing with Bitcoin. On the other hand, the decentralised module behind the financial freedom script Bitcoin volatility gives me another inspiration to get benefits from that. Bitcoin has become the most popular cryptocurrency because of its high volatility. Investors could get profits from the volatility. But as I said, financial freedom is more important for me. No one asks questions when I want to spend my funds, whereas banks ask questions when trying to withdraw a large amount.
Some people will argue that the volatile nature of Bitcoin is one of its biggest challenges. They believe that bitcoin adoption will spread faster if the price is more stable. Bitcoin will used more as a currency if it becomes less volatile. But to a trader or investor, the price volatility is the biggest attraction to bitcoin.
There are real estate and other forms, but they are not that efficient due to the lack of funds and the high taxation. There, BTC comes in handy. It does not have the issue of lesser funds, we can buy a single satoshi, and there is no huge taxation either. We can easily carry it with us, unlike gold.
Real estate investment is for the super-rich. Buying lands or houses is capital intensive, so not everyone will have the privilege or financial power to invest in the real estate sector. But with just a little savings anyone can invest in Bitcoin. They don't need to buy one bitcoin to be an investor, buying a few sats is enough. The profit from investing a small amount might not be big but it is a source of income.