"Line shopping can't make THAT much difference, right?"

I ran the numbers. 1000 bets. Realistic EV (8.8%). Kelly sizing. All bets hit at fair value probability. On a $10K bankroll, Best Book made $2,178 while Your (suboptimal) Odds LOST $2,593.

This isn't hyperbole. This is Monte Carlo simulation with 1000 bets showing mathematical reality.

Line shopping isn't about getting rich. It's about not going broke.