Q: Logically, as a tournament organiser, what do you want?
A: A full (and therefore profitable) shoot.
What drives a full (and profitable) shoot?
Lots of people entering.
Why do people enter?
Because it's a shoot where they think they can score well. (Other factors such as bacon sandwiches/close to home/etc may apply but are lesser factors)
Why do they think they can score well?
Because some big scores have been shot at that tournament previously.
Why will they go back even if they don't do well this year?
Because probably, someone (possibly a 'big name') has done well and proved it can be done.
So it's in the TO's interest to have people shoot big scores. Now, if you have a field with a slightly more sheltered bit (Andover Ladies end, for e.g.) it makes sense to put the best archers there so they can shoot some big scores, which will attract more people, and so you get a full shoot.