The "sharks" (themselves seasoned businessmen, all build up their own wealth, some are millionaire, some even billionaire) can sometimes be rather cruel but such is life. A good dose of reality from time to time is exactly what the doctor ordered.
Some ideas are simply not good, when there is no product-market fit, and revenue is very disappointing, then may be there is no market for the product/service and thus no business.
Another good series is Dragons Den from the BBC (also featured in many other countries), but I like Shark Tank more. The "sharks" are more sharp than the "dragons", the founders can pitch better, and the US has a larger population and thus simply a larger pool of good entrepreneurs and ideas. Added to that, a pretty big market is of course also not wrong.
Two of the most outspoken sharks:
- Mark Cuban is really great, he can appear to be pretty arrogant, but he is putting his money where his mouth is and doing lots of deals on pretty fair terms, in my opinion;
- Kevin O'Leary, "Mr. Wonderful", can be nasty, on the other hand, he never gets angry himself, famous for his deals that include royalty, but not equity.