$50/night is not anything I'm aware of.. even a basic 2-star guesthouse is more than that. Plus you have the cost of meals (usually at the lodging) and a driver to get there and then game drives so that you get to see the animals... I'd seriously double that budget for lodging, but then add in the costs of the food and transport. $300 per person per day is not unreasonable, though if you are creative and not picky, you may be able to be a bit less... or if you self-drive. That is another consideration, Tanzania is a long way from JNB!

Jill