I think the Price contract is a perfect example of the kind of high-risk signing that can make or break. Was it a good move or bad move? The jury is still out, I suppose. But Price was integral in winning it all this year, and as another poster here keeps saying, flags fly forever.
Plus at the end of 2018 Price looks like the real David Price, healthy and happy, with a rejuvenated pitching approach, and maybe a guy who can be a huge asset in his remaining 4 years. But who knows? The risk and uncertainty are still there.