I used to be concerned a bit about all of this but no more.  I simply use what I have and take my shots with that..composing the image in the frame I have to work with.   

What does concern me a bit is the way some advertisers do play into the game and sometimes mislead possible buyers.   

As far as crop factor is concerned, I see it this way too, an impossible trick to pull off but easy to think about:  Lets say you could make a contact print from a digital sensor, a contact print the exact size of the frame.  Now, make one with the film from a 35mm using the same lens.   The size of objects in the frames should be the same but the digital frame will be smaller, leaving out some info on the edges.