Nah need it for every single selection in order to make sure we analyse it right.

Here is something general though.

If your average odds is 30 your expected winners were 37.
If your average odds is 40 your expected winners were 28.
If your average odds is 50 your expected winners were 23.


Based on what I have seen you need average odds of around $75 before this would be a system I would look and even then I would be very skeptical.