Lol.
All the pitching we’ve acquired and drafted and we still have to pay big money to a frontline starter.
That's not entirely unfunny, but think about it for a minute. IF you don't have the payroll constraints that somebody like Tampa or Pittsburgh have that relegate you to constantly be in rebuilding mode because you can't afford to just throw money at that "last piece" - AKA a Darvish/Arrieta/Machado/Harper/Donaldson etc. - and you feel like you're entering your window, why wouldn't you cash-in the shiny prospects you have that HAVEN'T shown any chinks in their armor if they get you someone that's proven they can succeed at the MLB level???
For instance, everybody screams bloody murder when you suggest packaging Soroka, Allard, and other pieces for someone like Archer, but does anyone realistically believe either one of them has a shot at being a better Game 1 starter in a postseason series against a Kershaw/Sale/Scherzer/Verlander/etc. than Archer would? Gohara "could" be that kind of guy if everything falls perfectly and you're incredibly lucky, but if you were betting your house on someone facing off against Scherzer/Strasburg four times in a playoff series, wouldn't you rather have Gohara as your #2 even then?
If you don't have anyone in your system that you KNOW beyond doubt that can toe the rubber against a Kershaw/Sale/Scherzer without feeling incredibly overmatched, you eventually have to pay that guy if you're serious about taking that last step. This is the entire reason the Astros finally went and did what it took to get Verlander last summer - Keuchel has typically been really good (Gohara), McCullers has unbelievable stuff (Folty), but NOBODY (and I mean nobody) ever projected that Charlie freaking Morton (Wright) could do what he did during The Series.
For as good as Severino was last year, everybody saw his meltdown when it counted - this is the entire reason Cashman is trying to add Gerritt Cole. Now that Arrieta is presumably gone, Theo and Jed are trying to throw money at Darvish. Maybe those combinations aren't better "on paper" than Scherzer and Strasburg, but I think you have to feel a lot better about your chances when you can push everybody down a slot than running a Gohara/Julio (if he were to bounce back) tandem out there against them. If healthy, name a combination you'd run out there other than Sale/Price that you knew you weren't already behind the 8-ball with. Kershaw and who? Verlander and who? The Astros are even talking to Darvish because they realize Keuchel's likely gone after 2018.
This isn't meant to get the cart before the horse - just to point out the fact that an Arrieta/Darvish/Archer/Fulmer paired with Gohara HAS to make you feel like you've got a better shot at winning a series against that type of pairing than a Gohara paired with Julio/Folty/Newcomb/Wright/Soroka/Allard does - even if any of them actually ever reach their ceilings.