OP, where does it say there must exist a consistent, linear relationship between the value of bitcoin and number of new members on a forum board?
It is not consistent, but usually new signups = new interest = more buyers.
Correct me if I'm wrong... you appear to be comparing the exchange rate of bitcoin graphically with, for example, the
rate of new members joining in these forum boards. I assume by this you mean (new members/day).
Shouldn't you be plotting "total members" verse the bitcoin price, instead of the rate of membership change?
Then you would see that, in recent months, the price has been rising in a relatively linear fashion, as is the number of members. There's been no exponential growth, as with previous two crashes, to draw the same comparison. Growth over few months appears more linear.