I've never grown nuts (and barely grown anything else) so I'm not sure what would constitute a serious staple from them. I've got a big tropical almond. It fills with leaves and nuts twice a year (and drops every leaf onto the path from my driveway as often, haha). If I gathered them, I'm guessing a five gallon bucket's worth. Processing is a significant pain. Most of the seed is corky, floaty fiber, then a nut inside, smaller than an almond. Actually a pretty tasty nut.
I don't harvest mine regularly, mainly just to interest my kids and their friends. If I got serious about it, I'd guess two afternoons work would yield a quart of tropical almonds from my large tree.
I realize that all sounds negative, so let me throw some love toward my poor trop almond. When it's got leaves on it, it really is a nice looking, tremendously good shade tree. And all said, it was saved from the chainsaw only because I had a permaculture awakening (i.e. carpets of leaves 2x/year are actually a blessing) and I discovered it makes food (even if I don't harvest it for sheer laziness.
Helpful rambling?