Glad to hear so many people here grow veggies!
First of all, beyond financial...
1) spending time gardening and watching veggies/ plants grow is just one of my favorite things to do. It is therapeutic, it is a great exercise, and good way to get some sun. I just always feel great after gardening. Since it is a hobby, I won't count the labor/ time cost for gardening.
2) Having veggies ready in the garden means we can grow the most nutrient-dense variety of veggies and fruit. Also we can have them when they are freshly picked, when they are ripe, which makes a difference.
http://www.phoenixhelix.com/2013/07/17/the-most-nutrient-dense-fruits-vegetables/3) Having veggies on hand may save us trips to grocery store...
as for financials....
Produces in farmer's market here aren't that cheap and I happen to work on Saturdays when the local farmer's market open anyway. bummer.
So we have been buying organic (prefer local, seasonal) produce from our local health food store, so it is expensive. I'd say they range from $2/lb (kale, lettuce, apples) to more than $3 /lb (cherry tomatoes, broccoli, eggplant, etc.)
We already have some fruit trees on premise (pear, dwarf lemon, orange), and we plan to add more. We also started a compost bin. I understand that our edible garden will have most upfront cost (new raised beds, soil, fruit trees, having someone prune trees that haven't been pruned for years).
And we do have good sun.
But by my estimate...in our 2nd year, all raised beds will be up and running... If I can grow $5 worth of organic veggies (avg. $2.5 per pound) per season (3 seasons) per square foot (let's say not everything will grow well, so I am only counting 100 sq. ft instead of 140 sq ft). This would a conservative estimate of $1,500 yield per year.
That's not counting existing fruit tree yield...
Let's say in 5 years, we can start getting more fruit...200lb of fruit...That adds $500.
So in a few years, we should be getting at least $2,000 of food per year from our garden.
So even if we have to invest $1,500 in the first year, then $500 2nd year, $300 3nd year...we should still come out ahead financially in 2-3 years...
Does any calculate their yield this way?
-Donna