In area 51, it is showing that answer ratio is 1.6. It means there is 1.6 answer to every question on average.
Almost all questions asked in main site are answerable from scriptures only and are fact based. So a single answer contains enough details and another answer to the same question will be redundant in most of the cases.
Keep the questions with zero answers aside and consider the questions having a proper single answer.
Then what can one do to increase the answer ratio?