Okay, but have you read a construction of her actual system? It's not about greed, it's a system of ethics based on two things: basic metaphysical axioms you must accept to even consider any kind of philosophical discourse, and the fact that human being are alive. It sounds impossible, but she created a 100% objective system of ethics based on these principles, hence the name Objectivism. The point isn't whether you like the idea or not, the point is whether you understand the logical origin of the ideas and why they are correct. It's a deeply interesting system if you want to fully examine it. Here is a link to an objective source on her work including many criticisms that might help you understand it better if that's something you wish to do.
https://plato.stanford.edu/entries/ayn-rand/notes.html#note-7