The whole thing is stupid anyway.
If I have a game that I'm selling for $30 that doesn't necessarily mean that I convert into the local currency and sell that game for $30 in Nigeria (I have no idea what currency they use in Nigeria).
I might not be able to sell the game for $30 in Nigeria because that might be 3 months of the annual income. But I don't want to totally give up on the Nigerian market so I sell the game for $5, that way at least I'm still selling the game for some money.
To be honest I would probably prefer not to be basin my game pricing on the US dollar anyway right now. It doesn't seem like the most stable currency. Not many never was anyway.