Interesting, and thanks for the feedback.
Only some of my customers are construction workers, and they've left the line before when someone in front of them started ordering for their office, but I guess I would have, too. And I'm probably overselling the time to make the real stuff. It's basically squeeze lemon, add simple syrup, add water and ice, shake.
Another vendor did that with concentrate and didn't offer ice in the cups. Told people it was already cold, more ice would only dilute it, and that way they were getting a full cup of lemonade instead of a cup of ice and a little drink. Crazy enough the concentrate still comes out to about $0.80/serving like the real lemon version.
My biggest hesitation was on the perceived value of me just pouring it out from a cooler vs. actually seeing the lemons cut. I assume people will think the powdered Wylers version, regardless, and that they'd balk at $4. But I would have sample cups to give out to demonstrate it's better. But you're also right I'm convenient and 24 oz. of lemonade would hit the spot on a 95-degree day, even at $4.
But you both make a good point, too, it's basically the same cost from doordash.
You're also right that I could switch out. Dumping the concentrate idea would only cost me a $30 cooler and a $50 bottle of concentrate.