Now one thing you have said Animalman shows exactly why your argument will never win.
You have said on several occasions that certain films are not known to be remakes because the original is either old or foreign.
That is why they are remade.
The target audience for big blockbuster movies is as you say a late teen to mid thirties audience.
This audience would rather see a new film than an old film so Hollywood takes a tried and tested formula & remakes it,updating it for the modern audience.
And as for the all star cast for Oceans 11.
Of course an all star cast is gonna have more chance of selling,thats why people sign big stars to movies.
I'm betting though there have been films with all star casts that havent been big hits as well.
Nothing is guarenteed!
