Im gonna have to say NO!
Any smart bookmaker would have shaded in the past. That is, they would have given you higher priced favorites if you are a player, or they would have given you lower valued dogs, if you are more sophisticated, while dealing at the least, 2 sets of lines to its clientelle.
However, any shop that has grown to the status of top 3, or even top 20 in the world, has accrued enough public square action to see that they are better off fixing their line for all of their clients earlier rather than later, based on their sharper action.
No one can convince me that a shop with serious size needs to deal more than one line set.
Of course, many will disagree... and as they grow older and wiser, they'll see the light.
-lab