Every sale travels along a continuum from baiting the hook to feeding the fish.
The real meal, though, only comes once the big fish have decided to fund you. This little show gives potential investors enough information to make the enlightened decision to fund your company without overloading them. If they're interested, they'll ask for more. Joos calls this pitch decay, and it's a grim obstacle to any sale. It's not only possible, it's imperative.