One play at book b even if is at a worse number for fear that if you played it at a and it loses even though it is a better number at a, then you wouldn't be able to play an even better net value at a (over book b) on a later game? (like if you were running low on money at A).
In the past I have played a few favorites at a lesser price or line in order to not get dealt a duel line at that "square" shop. In other words, if you play nothing but dogs at bowmans or bodog it wont last long. Not sure it worked or not but I did get the square lines for a couple of years.
Used to love those shops that dealt 2 lines, one for the squares and one for the sharps. It was real easy to see what they "thought" was the right side.
Shops with Wiseguys Always leans back to the doggiee side. I said lean, not tilt.