It ‘can’ be cheaper for the quality, but it’s still a lot of work.

You need to preserve what you can’t eat outright.

You need to recapture/dry/replant the seeds

You need to compost.

You need to tend / maintain the soil.

You need to deal with pests.

You’re still not cheaper than farmer fred who’s sitting on literally 10 tons of squash.

You can literally work odd jobs and have more food security then trying to garden.