When I start use BTC I never thought I could buy BTC in so high price, and I still don't know I would stop.
I would not want to purchase Bitcoin at a high price because the amount of risk that it contains will only get larger if the price is up that high. Since the people that purchased or mined Bitcoin when it was within the single digit price range, those people are likely to dump and cause a price crash when Bitcoin gets really expensive for the average person.
I would not want to purchase Bitcoin when/if it gets around $70,000 per coin.
to me i am still too much confident that the price of bitcoin will go more high and high and at the end of 2017 it is expected that the price of bitcoin will cross 3000 USD therefore i am still buying bitcoin and i will continue buying bitcoin then the price reach to 2500 USD level, although during this journey the price of bitcoin will take some correction but over all the price of bitcoin will continue raising its price.