Any thoughts on holding this in the long run? In a 401k. I realize these leveraged ETFs are meant for short-term trading, because their price tends to "decay" (not the right technical term, I am sure) over time, but comparing it to the QQQs, it doesn't seem to decay all that much, and of course you get massive leverage. Any reason I should not put a significant part of my retirement portfolio into this? Call it 20% or 25% or something.
\