Because if you're so sure, then it's a profit opportunity for you. Talk is cheap, but you'll discover just how sure you are by whether you're willing to take the action of betting on your belief. And furthermore, seeing those bets will serve as incentive for those who know something to bet one way or the other, creating a price signal, giving us information about what's likely to happen, thus helping curate market expectations.
And if they're only betting bitcents then obviously it's not a very strong conviction.
So, basically, you're trying to muddy up rational discourse with fallacious nonsense. Got it.
It's a basic economic principle, actually. What matters is not what people say they will do, what matters is what they actually do.
If you produce a product and ask what price they'd buy at and they say $2, and you say, alright give me the $2 and here you go, and they balk, then they don't really want the product at all, even at $2.