BBUS, page-5660

Quite right.
If you're caught on the wrong side of it for months, as some have been, you'd find the index has to fall a lot further than your buy in price to even break even.

Learnt that the hard way years ago with a double leveraged currency ETF, it was losing 1% a month vs the undelying currency mvnt. 12% over a year for a major currency pairing just to break even if a very tall ask.