Maybe because thousands of people have spent millions of hours making the best search engine in the world and they should be rewarded for their work by making money off of it instead of giving it away for free?
as digital copies in most cases have no or negligible variable costs (support may be regarded as variable) the earnings for certain products can be way out of any sensible relation- but who should say: enough is enough? als long as there is no sensible answer to this question there can only be one: let the market decide...
Are you talking about a market with or without a regulated strong copyright law?
I realize it would be tricky to implement, but considering the societal benefit of more even wealth distribution the idea itself is worth exploring.