I care far more about having great beer to drink that I don't need to buy (or hunt for). Having a brew fridge, with three taps, also means I can have however much I want (until the keg kicks) and not open any bottles. I'm also providing my mother with top quality brew without her paying anything.
I enjoy the all grain process a good deal. I see it as an extension of my love of cooking, which I got from my father. Plus, making recipes gives me a creative outlet. Giving someone a glass of homebrew, that's 100% your own recipe, where you did everything possible (yes, I don't malt the grain or culture the yeast) to make it is very rewarding. I also like the granular control I have over the process with being an all grain brewer. I know plenty of people will call out how you can make great home brew without going all grain. I just can't see myself ever not being an all grain brewer. At least not by choice.