I am a Nigerian and I know how Nigerians behave. And as at 2011, the value of N100k was very high that it could buy you a plot of land in some mini cities. There is no how you will invest N100k by then as a Nigerian and became care free about it.
By that time you mentioned, it is only a few people that could invest more than N10k in an online business they consider a ponzi scheme. I am sorry, I do not believe your story.
Do you mean N100k equals 10k$? I'm not from Nigeria, and I don't know how big or small the amount is, but if what you explained is true. Yes, I don't want to offend, but I will call him a liar, and this story is fictitious. Although at the time, I didn't know if anyone had invested such a large amount in bitcoin, the fact that someone who knows nothing about bitcoin could risk investing such a large amount is fabricated. Moreover, how could he lose such a large amount of money so easily and without any safe storage method?