Reversing Google's results is an awful idea as you'd get the worst possible results for a search i.e. those that are completely unrelated to the search terms.

Reversing Google's results is an awful idea as you'd get the worst possible results for a search i.e. those that are completely unrelated to the search terms. You need to either remove the top 100 (or 1000 etc) and look at what remains, or reverse only the top 10000 results (or 1000 etc).