I think you may be in the wrong forum, here try this one:
http://www.banking-forum.org/Maybe there you will find the same conventional wisdom that you seem to have. Bitcoin does not follow the rules, it breaks them or have you not realised yet?
I think you need a grip on reality. Just because something went up, dipped, went up does not mean it will continue to do so. It might, and it might bottom out. Bitcoin is not guaranteed to increase in value in the short or long-term. Thinking you'll continue to be able to buy cheap sell high buy cheap sell high is irresponsible and foolish.