"Why does reality exist?"

I think the problem with this question is the use of the word "why." It is generally either a quest for intentionality (eg. "Why did you do that?) or for earlier steps in a causal chain (eg. Why is the sky blue?). So the only type of answer that could properly answer this question is one that introduced a first cause (which is, of course, a concept rife with problems) or one that supposed intentionality in the universe (like, the universe decided to exist as it is or something equally nonsensical). This is probably (part of) why answering this question with the non-explaination "God did it" feels so satisfactory to some--it supposes intentionality and creates a first cause. It makes you feel sated without ever having explained anything, but the question was a wrong one in the first place, because any answer would necessarily lead to another question, since the crux of the question is that of a causal chain.

I think a better question would be "How does reality exist?" as that seems a lot more likely to be answerable.