Sometimes it all depends on the individual and how he budget his spendings for the month. Yes Nigeria is facing economic issues that have resulted to high costs of living but even at that,I think an individual who doesn't shoulder any big responsible and if also he can utilize his expenses by cutting down costs then he can still save some discretional income for investments after taking care of his personal necessities. In other words there also fat salaries earners who are earning good money but are still finding it difficult to set aside some money as discretional incomes to buy Bitcoin. It's not all about the size of an individual income that matters but what matters the most is his level of financial discipline and how determined he his in achieving his goals in Bitcoin for the long term.
That's just it bro, in the history of Nigeria, their is no time it was easy, so life wouldn't get easier, you just have to get tougher, make more money and manage your finance properly, because their are so many folks out their that earn little, but they still manage to live a good life and still invest from it even more than those earning much, it mostly boils down to how an investor manages his finances.
So an average income earners must be financially conscious, in other not to mismanaged money meant for other vital things, that would warrant him to think of tempering with his holdings. Those rich guys can mismanage their funds and go scort free because they have rich uncles, dad, friends that can bails them out easily and their holdings is untouched, but a low income or and average income earners can't try that shit.