Simple supply and demand is the biggest reason, imo. There are 16M bitcoins in circulation. There's already 1M owned by Satoshi which many suspect that the private keys have been destroyed by Satoshi himself (true to his ideals) plus all the lost wallets, destroyed hard drives, Counterparty proof of burn (google it), etc. Let's say 20% of the bitcoins are lost forever so current circulation is less than 13M, that's the supply. The demand? Everyone wants 1 bitcoin, lol. Chinese, South Koreans, North Americans, Europeans, South Americans, criminals, wallstreet boys, bankers (oops, criminals represented thrice) and you got all the early adopters holding a lot of the supplies not selling them due to their ideals, they want to hold on to them....
It's a surprise price of bitcoin is not over $10,000, yet.
At least quantify it based on something... you're just shouting a number.
Again... why do people want BTC? Where does the demand stem from? If it's purely from the fact the everyone talks about it and it's hyped beyond anything I've seen... then it's a bubble!
Ideals... GTFO! If you would have 100 mln USD worth of bitcoin... you're telling me that you wouldn't buy something with it? A house... cars... that's a use and makes sense to me. Then BTC has value.
Probably you've got enough to sit on it and ride it out... it's going up anyway... again, that's riding the bubble.