As Ramit Sethi likes to argue, the greatest risk in financial management is ending up in analysis paralysis and failing to utilize your energy where you have much more leverage-- improving your own skills and impact. You risk over-allocating yourself not to an investment or sector but to financial greed itself.
Tho, in favor of the OP: GOOG 2012-present has doubled, but well-diversified leveraged funds have had better returns (TQQQ and SVXY are up ~6x).
I've heard that leveraged funds aren't great as long-term vehicles[0]. Even the summary of TQQQ says this:
Due to the compounding of daily returns, ProShares' returns over periods other than one day will likely differ in amount and possibly direction from the target return for the same period.
Though if you are into market timing, they seem cool.
Tho, in favor of the OP: GOOG 2012-present has doubled, but well-diversified leveraged funds have had better returns (TQQQ and SVXY are up ~6x).