I probably don't think closers are as valuable as some here, but of course they have value.
I just don't want to pay a 50-70 IP guy as much as a good starter who gives me 180-220. I realize high leverage situations are very important, but to me, so are the first few innings, where the game often seems to be decided. Without very good starters, there are often much fewer save situations.
The other main issue is about how to get a top closer. Free agency has been a good way, and that's how we got Foulke, but costs of closers have gone way up compared to other positions, and I can agree they probably were underpaid a decade ago. Trades are good ways to get closers, too, and the Uehara trade was one of Ben's best deals. The Kimbrel trade worked, as we got a ring, and he was a significant part of our historic 108 win regular season. Look, I loved the Sale trade. I had been scheming and suggesting trades for him for years and years. Not only was Sale a top starter in MLB, his salary was maybe 1/4th of his FA market value. The Kimbrel salary was more like a FA contract at the time of the deal and ended up being maybe 75% of top FA closer market value near the end. That's the part that bothered me, but again, we won a ring, so the deal worked out fine. Grooming a closer from within your own system is the bets way, of course, but it's not always that easy. Some could call it luck that we converted Papelbon from a starter.
I'm not sure Kelly, Barnes or Brasier are closer material, just like nobody knew for sure Koji was. Koji had much better numbers for 3 years before being made a closer than anyone we have now, and talk of Feltman sounds encouraging but far away, IMO.
I'd love to get a very good closer this winter, and if Henry is willing to spend enough to get someone like Eovaldi and Kimbrel/Miller/Ottavino, then I'm more than fine with the idea, unless their contracts end up keeping us from re-signing our core stars in 1-3 years. If you know me, I always go on the assumption we have an upper limit on spending. I know some disagree, and that's fine, but when I say, "Don't spend large and long on a closer," it's within the either/ or context.