If top Quora writers created another fake profile to answer the questions, would their answers get as many views and upvotes as they get now?

Probably not. This idea has been tested by a few authors.

1. Upvotes depend on followers. These are the people who like to read the answers and the writing style of writer.
2. Quora algorithms favor established writers.
3. The writer’s personality does have an effect on upvotes.
4. Quora shows answers based on preferences of users. Established writers are more influential in affecting the algorithms. Quora shows more of the writer’s answers to people who have liked their content any time before. Thus, a earlier history too helps any writer to get more views and appreciation.

This effect is known as Mathew’s effect in psychology.

https://hemantpandeyblog.com/2017/07/24/how-do-you-spend-your-day-quora/