Rizzo's extension was announced around Mother's Day 2013, at the time his MLB track record was a disastrous 50 games for San Diego, a solid half season with the Cubs(368 PA, .349 wOBA, 1.6 fWAR), and a good start to that 2013 campaign(a slug-heavy .366 wOBA in April). As David alluded to, he finished 2013 with a full season just below average(690 PA, .325 wOBA, 1.8 fWAR), and it wasn't until the next year that he took off, with 4 straight seasons of at least 4 wins. While plenty of people had optimism for Rizzo and very few people thought his extension was a terrible deal, it's tough for me to see it as the club taking advantage of him. You don't have to look much further than say, Josh Bell to see how this type of thing doesn't always turn good based on a single campaign. Plus, Rizzo was not too far removed from a cancer scare, which obviously played into his thinking and would have been another obstacle to clear if it had recurred.