I don't know why the price of Bitcoin is so high, maybe it's very high, because the market for Bitcoin is so limited that people would rather save Bitcoin than sell it, so the price of Bitcoin becomes very expensive. This is my opinion.
Well, if you gonna compare the orice of bitcoin compared to the others coins, bitcoin is the highest among the rest, maybe because bitcoin is the first cryptocurrent and a lot of people are now investing in it so the price is continuously increasing.