My 10 reasons:
1. You coudn't resist the price
2. new disruption approach( Blockchain)
3. usable
4. transaction posted publicly
5. Anonymity
6. secured, encryption
7. fund transfer low fees
8. Coins generated has limit (High Demand)
9. Decentralized nodes
10. make profits
Of course it is still you who will decide.
Risk? its up also with you how to minimize it, or possibly mitigate it.
Those bolded are simple not correct, and can be used as marketing for other coins.
Yesterday one exchange took me more than 10$ for transferring 130$ worth BTC. ZCash for example has almost all features as Bitcoin + anonymity using zkSNARKs technology.
Price per unit now is 6x bigger than it was at the beginning of the year. Investors could be confused with this extraordinary demand and amazing price rise.
Why then BTC? Because it is most popular as first of its kind. Because big capital flows in it while we are speaking. Because it is already mainstream!