Hi Joshua , welcome to Permies.
It's growing in my garden abundantly, bought one packet of seeds a few years ago and saved it and spread it. It's everywhere now! Yay!
It's a bit of labor to keep other plants out, but totally worth it. I just go out with scissors and chop away. It pops up naturally around this time of year here. Now it doesn't have a lot of taste, but it's very nutritious and the structure of the plants is very interesting.
It won't keep well in the fridge at this stage, one leaf, not even round yet..
The bigger it gets the more it makes stems, which can be quite tough, the softer bits are like tauge then, sprouted seeds of mung bean. That might be better to sell and keep well in the fridge.
Why not grow it in trays for people to buy and take home ? Or cut it there and then to sell from the trays if they don't want to carry them. Always fresh produce and when they like it sell them seeds. You'll probably lose them as costumers in the long run because it self seeds, but their neighbors might come to buy when they tasted it.
Have you looked into
land cress? That's a pirky one. Easy to grow and really gives a bite to a salad.
Which i found excellent as well is minutina/erba stella/ buckshornplantain, an italian lettuce with a nutty flavor, family of the plantain.
Good luck!