"afford to do" 是正确的表达，意思是“承担得起”或“买得起”，并且它后面应该接不定式（to do）。例如：
1. She can't afford to buy a new car.
2. We can afford to wait for another two hours.
没有 "afford doing" 这个搭配和用法。例如，在文档中提到的例句 "How can you afford to do something like this？" 和 "we made a massive mistake on the second goal and you cannot afford to do that." 都说明了这一点。
因此，当你想要表达“有足够的钱做某事”或“能够承受做某事”时，应该使用 "afford to do"。