If your list is permission-based, try out Constant Contact. If it's not permission-based, you won't like Constant Contact so go with a different company.
Africa isn't completely befeft of large scale corporations - there are the big mobile phone companies Celtel, MTN, plus Naspers (Pay TV, newspapers, internet in SA, interests in online companies in Eastern Europe), the big mining operations, De Beers?
One question i have is how the accounting is done for the $200k profit, bearing in mind the app benefits from the wider business (Carsonified events etc). As a standalone app it might be paying more for marketing, legal/ accounting, management overhead etc