The strength of Tesla comes in part from strong backing. If other companies were paving the same road as Tesla, it wouldn't be so big a deal. But right now, Tesla is still dragging all the other manufacturers along, and if Tesla fell, all the others would likely back down from doing EVs. There are many like myself who don't just want to see Tesla succeed, but are willing to provide financial backing.
While Tesla makes great cars (thank you, Tesla!), I buy from them largely just to support the company. As long as they stay true to the mission, if they were in trouble, I'd be willing to cut them a check for nothing in return. Many others would too. Even giants like maybe Google might be willing to cut Tesla deals to help Tesla stay alive if they ran into trouble. Tesla makes mistakes and has occasional trouble just like any company, but their mission, which is unique in the industry, is strong, compelling, virtuous, and undeniable. In my opinion, that earns a lot of backing other companies don't have and makes for a solid foundation for the company.
Call me a fanboy or nut, but I believe whether Tesla lives or dies will have a direct impact on the future quality of human life on the planet. There are many who talk, but Tesla is driving real action towards moving us towards a cleaner renewable future in both transport through Tesla vehicles and power production and storage through Tesla Energy. Those who support movements like this today are helping to ensure the quality and security of future generations of those who think it's all a political play or hoax; to those folks, you can thank us later.