Subject: Re: Wild-and-crazy idea
I do not have any idea of how you can tell when you should own TQQQ and when you shouldn't.

How about using the Nasdaq New Highs-New Lows? By selling TQQQ when that indicator goes negative should help to avoid 2000, 2001, 2002, 2008, etc. Buying when NH-NL starts going up again should work... most of the times.