I also do it because I have to. We were making about 33% more money when I was working, and even then, I hated to go buy groceries. I hated all that expense for something that would just be flushed down the toilet.
I am so glad I found this site! Now, I have more food than ever in my house (even though we make much less), I have a deep freezer full, and my cabinets have definitely perked up!