Nice one, given that this probably went down to the diff level it would be interesting to see it weighted by LOC changed, e.g. 10 lines in file A and 1 line in file B would mean file A gets 1/11th of the money assigned because it was the majority of the bug.?
Or perhaps a LOC changed / file LOC based distribution. That would be how buggy each file is, with a $$$ tag.