I am in a different camp. Like many of you, I have shot a ton of different bows and switched alot in the past. Classifieds used to be the "devil" for me. I was searching for a solution to my shooting woes and trying to find it in a different bow. Fell into that recently again, and have come to an acceptance of some things about myself as an archer.
I really believe that you are better off for your muscle and psychological memory to perform the task of a shot, to shoot only one bow. I think a back-up should be as close as possible in design and bow weight to the primary.
When you are in a "pressure cooker" situation of shooting at a game animal, you need the advantage of the response to the situation to be as automatic as possible. Your brain needs only the one reference of the repetition without changing a major variable. If you are going to change, I would suggest doing that at the beginning of the year, way before hunting season. Each bow has subtle differences.
You can shoot well with switching around, I have seen guys do it, i have done it in the past. I believe guys that shoot great know that one bow, and where it shoots, and do not cloud the mind with anything else.