(1) She believes that she deserves credit for the entire profit. (2) It's a complete no-brainer that prices go up if demand increases.

2 is fine. 1 is a bit odd. What did you mean to say?

1 is ok but something I'd see written more than spoken. In spoken conversation, I'd say something like "It is conceivable that she sees the whole profit as due to her." That's just my personal preference :) 2. Is fine.