Good point, thank you. The only reason is that compared to

investing in qqq (Control), the rate of return can be significantly increased with Method B.  You are absoluteoly right about the lost decade of 1999-2009.  That is why I try to limit the amount in tqqq.  In my example, I limited tqqq at $100k.  If the market drops, just keep adding into it so that tqqq has $100k.  If by 2009 there is $100k in tqqq, the next decade should do quite well.  What do you think?  Thanks.