Simple answer is no. Any day where I feel I have an absolute special I will bet large on it. When laying i will always lay to win $50min but never like to outley more then $200, so im usually on laying horses that are 4-1 or less.
Today was very weird with Oddin Warrior paying $4 win. I had it rated at $2.3. in hindsight i probably should have bet on the place at $1.9 but with how confident I was i stuck to my original bet.

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Betting and winning on an odds on favourite is better then betting and losing on a long shot....