Tesla will never do dividends. If it shocks me and it does, I am outta here.
Stockpiling cash is very different. First off I think TSLA should try to stockpile a certain percentage of its market cap in the long term view as a matter of insuring survival. I think five percent is a reasonable number. Obviously a general number to aim for, not a hard rule.
If not for cash piles, Apple would be a footnote of history.
Second of all, I do not expect Tesla to blow cash on bad return investments simply because it has a lot of cash. If you cannot put the cash to work well, then hold it until you are sure that you can. If Tesla turns into the cash producing machine we believe it will, do not be surprised to discover huge piles of cash on the balance sheet in the future as they determine how to deploy it.