The question is, what happens when a coin skyrockets to a price satisfactory to every investor? Definitely, more than 90% of the investors will begin to withdraw in order to make profit. This is one of the factors that has caused the drop in price of Bitcoin. It is called the correction period and until the investors reduce the withdrawal and reach a stage where another set of investments are made which surpasses the withdrawal, the bear market will continue.
2018 is a bitcoin correction year, bitcoin prices may be formed in the range of 4000 to 6000 USD for each BTC. It takes time to prove, the price of bitcoin is not too expensive but high fluctuations are more attractive to bitcoin users, especially those with little capital.
It has being correcting a lot in last couple of months and just creating more panic among the trader int he market. Thus people who cannot hold have started to sell and thus market is taking more dip. On other hand it is also the best time for big whales who might enter now and buy in bulk at such prices and make quick gains.