I missed this thread.
I grew up on a farm, and we built and ran a little hobby farm for some years.
Yes it's a LOT of work. Especially the way we did it. The more different kinds of animals you have, the more work it is. I had a rancher friend with cattle who worked less than I did - just dump hay bales and keep stock ponds full. I spent 6 hours a day just caring for animals - feeding, watering, milking, gathering eggs, moving pastures, securing at night.
I absolutely loved it though. And goats are fun. They can get into every kind of mischief though - if there's a way to get hung up or hurt they will find it. So you need to proof your pastures. You need to be aware of predators - including people's dogs - and deal with that somehow. In most environments worms are a thing that must be dealt with.
They have very narrow margins as meat animals - among the poorest. You do better if there's a way to market them as premium product. Basically the price for meat, the amount of meat per animal, and the rate of reproduction govern how much you can make off meat animals. Feed is often an important factor too. If you have good pasture and enough rain that cost can be less (goats are browsers though - not primarily grass-eaters, so good pasture for them is different than for cows). But they don't reproduce as fast as poultry or rabbits or swine, and they don't have the butcher weight of cattle or swine.
Those are the main factors I can think of for your questions. It's hard to consider it a primary business/income. You never know ... a late storm, a predator break-in, a drought year ... many things can suddenly affect your business, costing the lives of your livestock or their reproductive year or making them too expensive to feed. We had several setbacks due to things beyond our control. You have to be able to bear it and not lose everything.
But it's a great life. I'd do it all over again if I was strong enough. I still kind of dream of having a larger farm with two living quarters - like if ever my daughter with her family or someone else could move in and do some of the heavier work. I like the way it used to be done generationally.