My folks raised ostriches, rheas, and emus during the breeder's market craze. I think the most we paid for an adult breeding pair was $35k. The ostriches laid anywhere from 40-60 eggs/yr, sometimes more, which we incubated and hatched. Ostrich chicks were sold for $1500-3000/ea at a few days to a few weeks old. Our facilities were inspected by the USDA and we were licensed by them. Occasionally we would sell fertile eggs for ~$1000/ea.
Consider a cow that requires grazing space and has one, maybe two calves a year. An ostrich pair can produce >40x the many offspring in less space and the chicks mature to slaughter age in 14 months, the same as a cow. A single male can service a dozen females and this can all be done in a few acres of land, with less waste products as well. Our rheas were much more prolific, with one of our breeding pairs churning out over 120 fertile eggs per year. Our emus didn't produce well.
The ostrich cornea was said to be compatible with humans, the feathers are in demand, and the leather is strong and light. Even the egg shells have been used by Faberge and others. I didn't really care for an ostrich egg omlette but the meat is low in both cholesterol and fat like chicken or turkey meat but is a red meat. The adults weigh around 300lbs.
There were sometimes problems though. We had issues with egg shells that were too thick where the chicks couldn't peck through it and we would have to drill through the shell and help them hatch. Impaction was a big issue as the chicks would basically eat so much grass they would get bound up and couldn't get any nutrients. I did the autopsies. They will also eat any shiny piece of metal or nails and die. And if their body grows too fast, their legs cannot support the weight and they get bowed legs and other leg problems. The older birds will sometimes die just from the stress of being moved. We had a yearling once that walked on a slick surface and lost its footing, blowing out its knees and there's little you can do to help them recover from that. These problems aren't intractable, the poultry industry has solved a lot of them, and some of it was due to our own ignorance about proper feeding schedules and diet.
I still think there are merits for eating ostrich meat over cow meat. I feel like an ostrich farm can scale larger than a cow farm with less environmental impact. But I just don't think Americans want to eat ostriches.