The bigger the field the bigger the certainty

Ridiculous idea that the bigger the field the bigger the certainty.
The bigger the field the more traffic probs you are likely to encounter on the way through.
Need to be in front and hope those behind get in each others way.

Some sayings in racing I never did get, and thats one of 'em.

Yea, akin to 'back outsider of three'. All crap - and all spouted by 75 year old tramps in betting shops in the 60's and 70's.

"the horse doesn't know what price he is" 

Pound for pound Ezra.

"the horse doesn't know what price he is"   

No but the jockey, the owner and the trainer do.
If Barney Curley and Michael Wigwam know, the horse gets to know through the reins !

If you see a 7/4 fav in a 20 runner race, with the second fav at over 6-1, as opposed to one in a five horse where the second fav is priced at 9-4, which one would you rather be on?