As per i understand the people holds bitcoin for many reasons.
1.Its a whole new technology.
2.You can send money to any where and everywhere in world without any bank.
3.The price growth of bitcoin is a inhabitable thing no one can stop its growth.
As you are saying it falls more than it rise.I am sure you are only watching it for 2-3 moths only.
Enlarge your vission and you can see a larger picture for sure.