There's lots of ways to cut the bulk of the cost out. Plus- gardening is a hobby on top of being productive. Counting labor costs into something that I WANT to do doesn't make sense in my case. I also don't count my labor into my wood pile cost, or I might start buying it. I could be a poor guy with a TON of time on my hands if I paid others to do it all
If you get serious, you can start your own seeds cheaply, and split costs with someone else. Who uses a whole packet of tomato seeds (well, maybe SmokinJ, from the sound of it!). I want to start a sharing this here where I start these couple things, someone else starts some other plants, and we trade.
I don't have much prep of the garden- I don't till. Pull any weeds, plant, dump compost and shredded leaves on there.
I don't do much weeding at all- the mulch suppresses weeds really well.
After being established- I didn't water once a week- the mulch keeps moisture in (and reduces blossom end rot)- of course I'm not in super full sun, and we had reasonable rainfall.
We do start all our plants from seed. Both our homes are disaster areas from January to planting time. By March I'm praying for the end of deep freezes so I can get my early vegetables in. We were eating baby spinach in late April, peas the beginning of June, tomatoes the beginning of July this year...actually the very first were mid to late June, summer squash in mid June.
Started gardening with a friend because my woods have grown in so I have almost full shade...well, lots of shade and the 30 foot tulip tree I let grow in a corner of my garden doesn't help...so we're in blazing sun, deep soil, lots of wind. This dry summer was a killer. I've almost talked my friend out of tilling...have an area we don't till at all....mulch everything...but it was so windy and dry this year that we were very dry and had to do lots of watering....very windy, so some mulch got blown around....especially in the new area, always weeds despite mulch, easy to keep down if one keeps after it. ..(weeds because of wind and proximity to hourse pasture)< Because we are gardening together got more ambitious, added about 50 feet to the garden...now about 150 x 35 feet....we're growing summer and winter squash, borage, nasturtium, pole, bush, filet and lima beans, snap, podded and snow peas, 40 varieties of tomatoes, spinach (8 varieties), chinese vegetables, red and white cabbage (which we cut early so we get a second harvest of four or more smaller heads), kohlrabi, broccoli, egyptian walking onions, sage, rhubarb, carrots, beets, many varieties of lettuce, radicchio, mustard, kale, parsley, basil, lavendar, lettuce, turnips, parsnips, swiss chard, brussel sprouts, red&white&green&purple cauliflower -anyone who hasn't tried the purple cauliflower should, as it is bug free and drop dead gorgeous and tastes better than the white- , 11 varieties of potatoes, celeriac, leek, onion, garlic, cukes and three varieties of sweet peppers.
My seeds keep a long time...that's why I have 40 varieties of tomatoes...add a few each year. Oldest tomato seed I used this year was 2002. Have dozens of pea and bean varieties, 8 spinach, many squash, tomato and carrot...part of what makes the gardening fun and rewarding....was just mentioning my friend's comment about cost....
Maybe we should try a seed exchange.....do you keep much seed from your plants? Easy with peas and beans. May try growing one heirloom variety of each vegetable at my place each year in order to propagate the seeds, if I can get the heart to cut enough trees to get enough sun.