I'll keep the ratings method to myself (although its really nothing special) but the pricing method I use is one that was posted on here a while back from a Betfair article that uses a power number. I think you mentioned that you use it for your greyhound ratings?

I found the whole idea quite by accident when I was looking at ways to filter the ratings, I just put all selections in a spreadsheet with the rated price and SP (TAB not track) and then started a few "what if" scenarios.