I cant be too hard on tipsters as they don't know what the odds will be at race time so I they can only tip what is going to be the most likely winner and that is not surprisingly the favourite or second favourite.

I wouldn't use them in a systematic method though as they are not a controllable variable. You don't know when they are really putting in the work vs just going through the motions (or copying from somewhere else).

A rating is consistent though (providing you can talk to the person who creates it and they let you know when and if it changes). But there are still times that these can change and you are not told but its less changes then a tipsters picks.