John,
Most supers use a system to evenly distribute wear, and can't "just put them out there". The maintenance factor of distributing wear may supercede balance play difficulty or balance, unless a special event is scheduled (ie tough pins for a tournament, or all easy ones for a scramble or ladies day).
Most use a tic-tac-toe board pattern of nine spots. Some use a six spot board (Back, Middle and Forward, for Right, Left and Middle positions - middle excepted in the six spot)
Further, most use a pattern to move the cup as far as possible from the previous day on each green, such as BACk LEFT,CENTER MIDDLE ,FRONT RIGHT, BACK RIGHT, LEFT MIDDLE, FRONT CENTER, BACK CENTER, RIGHT MIDDLE.
Most will put the pin in each location twice or three times per round, usually making up a card for the pin setter dictating where each hole goes. It's typical that the placemnt card follows a similar rotation as each green, so the golfer faces a nice balance of pin locations through the round.
In one way, this gives good variety. However, it may lead to all par 5's having a back pin, especially if spaced six or nine holes apart. As a designer, we try to vary the various types of holes to have a balance of "Sunday pin" positions among 3's, 5's, long and short 4's, etc. but usually defer to the best possible hole, even if, such at Cowboys, two par 3's (3 and 17) have the difficult pin back left.
The point is, we have gone through the math of trying to design the set of greens both for difficulty balance using a standard rotation, and there are too many variables to really establish a perfect rotation, except when someone really pays attention for a special event.