i tend to think of it this way - every future season carries some volatility for any player in terms of performance, no matter who it is. The older a player gets the more volatility there is. Take Harper for example, has a 9-WAR season and an MVP and hits FA at 26, seems like as good a bet as any to live up to whatever deal he gets. But even he has had multiple injuries and up and down seasons. Still, because of his age and track record, he can command a very lengthy deal - it's literally the price of admission to even begin the discussion of signing him. Ideally maybe you would sign him for say 6 years so you're not locked into his decline phase. He may still be very good from 32-36 and could very likely be worth the money through that phase, but there's a much higher chance you're getting your money's worth (or surplus value) out of those first handful of years. Regardless, he's getting 10+ years. So say Harper had demanded an opt out after 4 years so he could hit FA again at 30. The scenarios are this: * He gives the team surplus value for those four years and leaves - Not ideal but hey, you got surplus value so it's still a win. * He is merely worth the contract and leaves - again, not super ideal but at least you got your money's worth. * He is injured and declines or plays poorly and chooses not to opt out - 10+ years was the price of admission so even with no opt outs you were going to be stuck with this anyway. In the first two scenarios, at minimum the signing still worked for you. Not to mention that you may be in a different window where you're not interested in 6+ additional years of a past-prime outfielder anyway. in the third scenario, opt-out or no opt-out, you were going to have him for the length of the contract he could command regardless. There’s a fourth option: he continues to provide good value for the team in the later years. By completely removing that option, you meaningfully change the expected value of the the deal for the team. It’s like sitting at a blackjack table that only pays 70% when you win. You can say “well, if we win we are still ahead, and if we lose we would have lost anyway, so what’s the problem?” But that 30% chop to the payoff meaningfully changes the average value of the bet. Sorry, I actually meant to include that scenario. It could definitely happen, but that's where the volatility comes in. Is it likely that they provide expected value the whole way through? Maybe, maybe not. Is the gamble that they opt out at 30 and provide lesser value for someone else on the backend of what would have been your deal worth it? Could be. Either way, as long as opt outs are allowed, any player you give one to was either going to get it from you or from someone else.