I'm South African, and I don't think it's affected my channel much, although there's no way to know for sure. The majority of my views are from US, UK, Canada, Germany, Australia (in that order) followed by a seemingly random list of countries around the world. I have 4 times as many US views as UK. I think it comes down to the audience retention your channel can achieve in each country. I've always had great average watch times in US, UK, Canada and Australia so this may have led to my videos being promoted there more than in other countries. The size of the US population also explains the ratio of views between US and UK with Canada coming in at half of the UK views.
I don't get even 1% of my views from South Africa :O Data is expensive in many parts of the world and internet speeds low so retention in many countries is lower than it could be, especially on longer videos.
I would also love to know for sure if channels in certain countries are given an edge, but I don't believe so.
PS. OP, have you seen the success Suzelle DIY is having? This is a great example of a home grown channel that is doing well even in SA's relatively small market. She had a slow start but her channel is booming since she started getting media attention. I think she's doing well because people here are craving original content with an SA flavour/humour.
I wanted to look at your channel but your link isn't working.