@inthehands "- But under normal conditions, you lose money on them."
This part's very important. Most docs I have seen on inverse ETP/ETF/ETN say that this is something that you buy *for a day* as a short term bet, otherwise you get into something about "compounding risk"
So, holding long term might work to push the stock down, but you will tend to lose money if you're not in and out relatively quick.
Definitely something to buy the morning TSLA announces earnings, I think.