Is 2.5% (12.5k page views per day) good as compared to my total index pages which is 5,00,000 pages?
If not, how much % should be a good one?
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There is NO right or wrong answer. It is impossible to even guess without an idea on what your pages are about.
Think about it. Imagine if you have a news site with 5M articles, you probably have very few articles read each day since people reach much more about recent events. Then you are a store with 5M articles for sale and people only buy 2% of what you sell. You'd be out of business quickly!