Contraception is one of the areas we've considered focusing our efforts on in a product we're building: http://wellapatient.com It's, however, a tricky enough market to access and develop for many reasons. We've put it on the backburner as a result.
One such reason is the percentage of non-contraception use. Your anecdotal figure of 95% is rather exaggerated. This report here (PDF), on an intervention on the matter, suggests baseline non-contraceptive use rates of approx 38 - 64% in southern/ central Nigeria, 73 - 92% in Northern areas. There are clearly cultural reasons why this is the case. These same reasons make the market quite tricky to access.
To complete the original statement, my team and I believe there is a billion dollar opportunity in chronic disease care. It is already a multi-billion dollar industry in the west and east and is slowly but surely making its way to Nigeria and Africa.