My own thoughts:
1. Gaming prima facie may not be unethical. If the content is too aggressive, vulgar and show-case negative value (considering the target audience, children), it may not be holistic.
2. Every interaction should pass the 'win-win' test. Then, even if we make a mistake, it is fine! The problem is when we try to act smart and act to the detriment of someone else.
3. Business & Ethics are surely not an oxymoron. There are many who still live and work by values, across all areas, including business, art, science, sports, et al. Hence, the world still survives :)
The Ethics Coach on Practicing What You Preach | Entrepreneur.com