I never found market growing to be worth it but as with everyone, YMMV. We know several people who do it and apparently succeed. But it's really really hard and success is never easy (or even sometimes possible). A big part of it depends on where you live. We're in a rural area and only a small handful of people want to buy produce from a farm. If you lived on the outskirts of Dallas, TX or Portland, OR or San Fransisco things would be different.
We do homeschool our children and always have.