UPDATE, July 30, 2016: The cost of Uganda single-entry visa has been reduced back to 50 USD, so the double price was a short experiment ending in a foreseeable failure. For Malawi, the current visa fees appear to be 75 USD for a 3-month-visa, or 50 USD for transit visa valid for seven days.
Just as Kenya stops issuing visa on arrival, two other African countries punish tourists by significantly increasing visa fees. Reports say that the cost of Ugandan single entry visa has been doubled from 50 to 100 USD, while the Malawi visa is or will be increased to 75 USD, while previously visa-exempt nationalities have to pay for a visa.
Western tourists are used to visit most countries of interest without having to pay for a visa, but just few of those countries are in Africa. Recent fee hikes further highlight the divide. Majority of potential tourists shun Africa due to numerous image problems the continent has, and new visa rules will not improve situation.