For me, its just a simple answer. Curiosity and because it is the trend nowadays. I hope bitcoin live long xD
Why is any investment made ? Money.
99% of the people will say that, and the remaining are lying.
If you aren't putting in any money, and gaining Bitcoin, you are investing time for Bitcoin.
Nonetheless, you are investing in Bitcoin, and like any venture, everyone is in it for the profit.
i havent invested any money in Bitcoin , i just use faucets and this site(signature campaign) to gain btc