I love Okadabooks. It's a beacon of hope for writers.
I have received complaints, however, which i believe may be the reason why sales for some books are low or nothing.
I just published Abroadism: Fatherland versus Foreignland. And I as well as friends did a lot of reaching. But some complained that the minimum refill amount is NGN 1000. I believe that is good in he sense that it helps to encourage a buyer for next purchase -retains the buyer. But it also sends many interested buyer away.