Other elements factor into share/debt cost analysis:
1. Culture — They appear to still have a startup "let's solve the problem" mentality
2. Distribution — There are no networks of dealerships taking a cut
3. Marketing — They don't need to pay for it at all right now
4. Legacy — There are no pension funds and other obligations on them
5. Environmental icon — There is a lot of political support for them
Tesla is still high risk, but they have a big potential upside.
Contrast with e.g. GM:
1. Old-school Culture of "if you build it, they will come"
2. Mandatory dealerships
3. Big marketing costs
4. Pensions are underfunded and they have a huge inventory buildup (and defaulting subprime leases are mounting)
6. They have a lot of political support, but it's not for environmental reasons
That's pretty cursory, but illustrates a few factors besides just the product.
Tesla's burn rate is a marginal-risk long factor, if/when they get past their manufacturing bottlenecks.
[edit]: Newlines.