Why would RSA host 2 D/N matches versus Bangladesh ? The crowds should turn up for a D/N game,which I'm pretty sure they won't. Also, the cost of hosting a D/N game is much higher than that of a day game.
Why wouldn't they go to watch the matches?
South Africans love watching their team rolling against any other opponents which is pretty obvious. Also, Johannesburg have got pretty decent amount of Bangladeshis living in it and there are also many others living in the other cities of South Africa so I dont think it is a bad decision to host day/night matches.