I really don't think that it's fair to compare Tesla with Coupons.com. Tesla has net assets of $2.4 billion, with IP that's worth a considerable amount. This is evidence to show that it may be worth investing. What does coupons.com have? A failing 16 year old business that hasn't once turned a profit?

Edit: Just noticed you said COUP aside. I agree with you – the comparisons from tech or unprofitable IPOs don't add up.