I never know what to think when I see threads like this. On one hand I'm glad because if people are spreading such monumental ignorance, they and people who are gullible enough to give them credibility are losing even more money than they have to and that keeps the industry where I make my living healthy. In effect, guys like jj are paying my bills so thanks.
But I'm basically a nice guy - and this forum has helped me - so I'll do my part to give back. Fortunately it appears that most people see this thread for what it is but just in case there are any novices out there to whom one more voice will make a difference, I'll contribute:
Someone said, "winning is key." Very true. Line shopping means your wins make more money. If you find a better moneyline, your wins make more money on the spot. If you find better spreads and totals, sometimes loses becomes pushes or wins, and sometimes pushes become wins. That's all more money. I feel completely foolish even explaining something this obvious but apparently it is not too elementary for some people.
I am the first person to use the phrase, "in my opinion" when applicable, but this is simply not debatable.
If anyone thinks more money is over-rated, fair enough. But you should say that up front when you post.
If you can pick 70% winners, fine, you don't need to worry about line shopping. You can light your cigars with hundred dollar bills. Go nuts. Or if you're a very casual hobbyist who accepts you're going to lose your money, shopping probably isn't worth the effort either. For the serious among us, line shopping can be the difference between winning and losing (or else the difference between winning and winning more).
IMO, that's not over-rated.