Well, you can still do that. You would just be buying eggs, hatching, raising and selling. Nothing wrong with that.
Keep in mind supposedly 1:5 hatch/make it to adulthood. So you would have to adjust your price for that, housing, and food.
Supposedly in 5 weeks they are Mature enough to breed, but have a lifespan of around 6 months to 1 year. Some people are fine with that, others are not.
They are kinda like shrimp, the higher the temp, the faster/shorter their lifespan.