No-one has ever attached share value to the performance of a company unless you're looking at the longer term, for example if you want the dividend payout but Tesla does not pay dividends. Volatility represents where the money is made and what's keeping the price up is also the fact that Tesla is the 3rd most traded stock in the US.
As for the doom merchants on here, well just look at Apple. Apple is the most valuable stock in the world by capitalisation and perhaps company performance yet the stock has crashed 24% over the last 12 months. Would you now refuse to buy Apple in a low under the assumption that Apple is going to go bust and it will never recover? That would be ridiculous.
Amazon and Microsoft shares are also at their lowest values for 12 months so maybe those on here are actually wrong and what's happening at Tesla is more reflective of the collapse in confidence and value, plus high interest rates within the US economy. This won't last forever and it will of course recover eventually which is why it's a great time to buy.