OK My Opinion: I think the categories are great for this contest. Remember this is not a big bike show with trophies and prize money, it's a bunch of friends really just wanting to show off their bikes with pictures in the entry forum. And a few of our good friends wind up with their bike on the home page.
Lucky, I would hate to be in your shoes if you have to start making judgment calls on what is custom and what is not, so the hard fast rules for actual modifications are a great guideline. Besides, I have seen some pretty much stock bikes, paint and all win or come really close to winning, because they are nice looking bikes. Hell there ain't one person on here that rides a bike with 100% of the parts it came out of the factory with, so they're ALL customs.
I seems to work fine, most all bikes get some votes...So until it breaks, don't fix it.
Just one mans opinion! (but it's the right one