Yeah, the "fools" line is an indicator that you are burned out and have lost your belief in the mission. You'd be lying to yourself and others if you continued.
I didn't read the Forbes reference because ad block, but I'm willing to bet that is a pretty common expression among _observers_ of the tech startup/financing scene. Coming from a founder who's been cashing the "fools" checks... well I can only hope it's a lot less common.