This is the weirdest thing I've ever heard. Only 1911's? Every 1911? Every gun that looks like a 1911? Old, new, doesnt matter they're all just jamomatic pieces of junk despite the fact that everyone else's experiences are markedly different and it's the gun not the gunner. Hey, like others have said though, theyve had a few bad ones through the years but either solved the issues themselves, had someone else fix them or sold the guns, then, the OP ended up buying all of them.
The 1911 platform has a service record of over 100 years, through war, through competition, military and civilian use and has probably more fans than any other platform and if I had started buying as many as the OP and NONE of them worked I would have to do some serious introspection. I would feel more than likely that I'm the source of the problem, not the gun. It's TRUE that some guns do in fact require training and technique to operate. The striker fired Tupperware wonders of today I think do not fall into this category. They're made for the intelligence level of today's society. Going downhill?
I am far less learned concerning the 1911 than most here I'm sure, I've not had nor do I have as many as most here but it has always been and always will be one of my favorites. I'm also probably in a different socioeconomic strata than most here and believe me, I've had some budget 1911's and have never had a string of misfortunes like the OPs and really think I would have just moved on after 1 or 2, there have always been alternatives out there, a revolver maybe.
I am in no way doubting the OPs experiences, just the causes. I do applaud his persistence. Also, inflection is something that cant be conveyed via written/typed word so please do not read sarcasm into my post, I assure you, there is none.