FYI I ran across this article showing comparing the economic impacts
of using bees and humans (from a real world case in China) for
pollination.  I'll let the article speak for itself:

From the abstract:

"Using the example of apple tree pollination in Maoxian County, China
we argue that destroying and replacing the free gifts of nature can be
an economic benefit. We do not argue that the positive economic
benefits justifies eliminating natural processes. On the contrary, the
Maoxian case illustrates the danger of allowing the logic of the
market to drive conservation policy. The conflict between the market
economy and the natural world must be recognized and addressed in a
more substantial way."


http://www.economics.rpi.edu/workingpapers/rpi1202.pdf

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