Subject: Re: Wild-and-crazy idea
But looking closely at my spreadsheet I made a mistake. It evaluates weekly but trades daily, which is wrong.

Well, that was an easy fix.

Not much change in the results, though.
52 week SMA, trade weekly
............... QQQ....3X
2000-2023 8.00% 14.73%

2000-2010 4.12% 0.93%
2010-2023 10.95% 26.07%

$10,000 on 1/1/2000 grows to $61,560 for QQQ and $256,632 for 3X QQQ. But all that TQQQ growth came in the last 13 years.
To 1/1/2010 it only grew to $10,967.