The V-2 being more sophisticated was also very easy to sabotage by the forced-laborers used by Von Braun’s outfit.
The V-1 was cost-effective only insofar as the Nazis, by that point in time of the war, had no other way to drop a 1-ton bomb on London (they had virtually run out of experienced bomber pilots and protective fighter pilots, they were low on fuel, and their bombers were too vulnerable to radar-guided anti-aircraft fire).
Even earlier in the war, during the Blitz, when Germany still had plenty of good pilots, planes, and fuel, and British defenses were still in development, even if V-1s had been available, it would STILL have made more sense (cheaper in German Marks and German lives) for the Nazis to instead use conventional bombers rather than V-1s.
It's as though your car were broken, and you had no recourse to taxis, friends with cars, bicycles, municipal buses, etc. - then, indeed, strapping fireworks to your 6-year-old son's plastic scooter would truly be the most-efficient way to get to work on time. (Indeed, it might be your ONLY way to get to work on time.)
If, at ANY time during the war, you had given London the complete plans for constructing a V-1, and a finished factory to build them, London would nevertheless have been foolish to expend an ounce of effort in manufacturing its own V-1s.
Even late in the war, V-1s were piss-poor weapons in terms of cost per enemy death. They were terribly inaccurate (and London had arrested EVERY Nazi operative in London from the start and "turned" them - so the secret transmissions being sent to Berlin on V-1 impacts were penned by the English and thus ensured that the "Buzz Bombs" consistently fell short of their mark).
What was true for the V-1 was true in spades for the V-2.
They were effective ONLY from a psychological point of view.
If I tell you that I'm sending my 12-year-old daughter over to your house to beat up your 18-year-old son, you will chuckle. (In spite of the fact that there is still a distinct statistical possibility that my daughter might happen to get a good punch in and maybe, through sheer luck, poke out your son's eye.)
But if I tell you that I am releasing genetically modified mosquitos laced with Ebola into your neighborhood, the "Fear Factor" might paralyze you and your family - even though, statistically, the actual risk to you is negligible.
There was no practical defense against the V-2. When you are presented with a small but fightable risk of death, you will cope with it somehow. But if I present you with a microscopic but unfightable risk of death, you will feel helpless and succumb.
Regards,