Do you generally expect assets to continually double in shorter and shorter timeframes? The chart is starting to look rather parabolic. Not saying it is going to crash here but if i continues to grow the daily growth it is the likelihood of a crash increases.
One can simultaneously believe in the long term possibility of Bitcoin and also believe the exchange rate has come too far too fast and look for a correction. Ironically enough people being cautious about the possibility of a correction can slow the bubble and makes a correction less likely.