What do you think Microsoft does with all those error reports that they ask you to send?

Do you think that when Microsoft asks whether the error should be sent to them and you say yes, that anything actually happens? Assuming that the report actually gets sent, what do you think they do with it? Do you think that if they get a large number of reports with the same error type, that the error is flagged to be looked at by someone? Pardon my skepticism but I think that the chances of an error report eventually making a difference are pretty small.