yeah, you're mostly right. in theory, oddsmakers want equal action on both sides of a line: winning and losing bets cancel out and their guaranteed profit comes from the commission, juice, etc.
in reality, booksmakers shade lines because a) it's pretty easy to tell which way the public is going to bet (favorites and overs in football); and b) professionals bettors know this and will pound a line that has been overadjusted.
nobody wins these debates. personally, i would never compare an option offense to a balanced one like Southern Cal's. but here are some interesting stats for comparison. (since i'm not even an SC fan, i just don't care enough to search further)