[mannerheim]

I don't think the result is economical purely because if it were, Google would be monetising their own models by now (of course, maybe they could monetise it if they were willing to go with a paid instead of ad model for search).

[boplicity]

I think there are a lot of assumptions that Google hasn't already integrated this type of technology into their search engine. I suspect they have, but they've done so conservatively, to avoid changing how their "Golden Goose" lays eggs.