BadshotBob,
To answer your question...No it's not necessary to shoot year round. I've got a buddy that does the same thing as you do. Picks his bow up a week or two before the season and flings a few arrows. Hunts from a tree stand and only shoots 20 yards. Timber where he hunts is really thick so you can't shoot much past 20 if you wanted too. Been doing this for 30 years. He's got some pretty impressive heads on the wall too. He works alot and enjoys fishing as well as other types of hunting. Good for him I say!

I like to tinker. Mess with my stuff all the time. I also love to shoot my bow. I have an outdoor range set up in my yard so I shoot spring, summer, and fall, and in the winter I get to an indoor range every couple weeks. I will say that I'm a far better target shot than my buddy. But he's taken larger deer.[:@] Part of that is that he hunts on his parents farm where no one else hunts except his brothers and his wife. (She bowhunts too)

To each his own. If you can accurately shoot your bow good enough to cleanly take an animal doing it your way, I say knock yourself out! If you like to shoot a lot, then do that too. Steaks on the grill are the end result in both cases.