Sub Sahara is not pretty backward that they can't manage their finances . When a startup is doing marketing pitch let them paint the real picture. I know we are not where we ought to be but we are not lacking in the area of innovation and creativity.
If they can take what they get and run with it in pursuit of the idea that got them the investment, they've now created value where none previously existed. Commence the theoretical positive cascade of investments and growth and having an exit strategy so that investors and entrepreneurs get back a return on what they invested.
The part that's kinda taken on faith, though, is whether the value created will stay in the area. Unless there are huge incentives to stay local, I see the companies, exited founders, and investors all taking their funds and resources back into developed nations rather than staying local and perpetuating prosperity where they first laid their roots. There's hope that there'll be a will to stay local... but man, people tend to take whatever chance they can get to escape a bad place.
Are you talking about the foreign investors or locals who've succeeded? I can see locals using their new wealth to escape, but if it's working that well for the foreign investors, I don't see why they'd leave (at least in the short term - over decades the brain drain effect would be real).
Those of us who've stayed back and are actively involved in tech entrepreneurship have little desire to leave. We would have already, we have the skills.
Ghana might not have it the best, but every country started like this. It takes dedication from its citizens to grow and that mindset is catching on now.
Not to detract from the rest of your answer though.
Seems like there might be some money to be made there beyond food and water.
Well these people pay rent, electricity, phone bills, buy clothes, food, education for the kids, have cars, etc... Surely you can make money from them.
The part about training for business conduct feels a bit iffy in tone from the level of detail it goes into. I bought a company in Germany a few years back, and my Canadian sensibilities certainly offended folks until I learned the rules of the local culture. Any cross border business interactions are fraught with this.
A few of my friends are currently investing/managing a company out of Ghana. Extremely low investment has yielded a great growth curve, and they're changing how sub-Saharan Africans manage their finances. They're some of the happiest investor/entrepreneurs I know.