I'm sorry you feel that way but I think you're being too negative when you say "nothing productive" has been done or that pilots were a miserable failure. Yes,

I'm sorry you feel that way but I think you're being too negative when you say "nothing productive" has been done or that pilots were a miserable failure. Yes, things failed but at least you know more about the market, how to (not) build things, etc. Consider pivoting into a similar area using your newly gained skills instead of shutting down. Also, if investors feel like the money should continue to be spent, that's a business decision and you shouldn't feel bad about it (unless they are super ignorant of business and invested for emotional reasons. If so, then educate them and it's their decision in the end). Best of luck!