The idea with El Greco is to form a book, and yes, if you take out the horses that can't win the rest of the field must have a 98ish% chance of winning.
Last week was a good day, by using the system I was able to find 7 out of 8 winners. Five of them were over the odds calculated by El Greco. Wish it were like that every week.
The boredom factor is an issue with any mechanical system but tell that to the tortoise when he won.