Purely for an investment though I would like to spend them on things in the future. Hopefully more places accept them worldwide so you can pay for things on your holidays. I think it's quite easy to make money on bitcoins especially with the fluctuations and the upcoming halving so now is definitely a good time to buy.
Investing is the best reason to buy bitcoin. And it is also easy to manage and easy to use in transaction. Aside from that we all know that the value of bitcoin change/increase everyday. It just depends to us on how we manage bitcoin.
Of course, the reason why we buy bitcoin is because it is a big investment, since the price of the bitcoin keeps on rising we always get a profit out of it, buying bitcoin is not just about investment it is also a safe way to store your money, an easier way to use money on the internet without having to compromise your personal data.