By the awesome number of posting I have, you can tell I am relatively new as well.
Well here goes.
1. Some do and some don't. I think it's fair to assume the dealers sending out Q.C. (quality control) photos are handling each watch before being shipped.
2. With all components being the same, I would use Bloomingdale's and Macy's as an example. A sweater from same manufacturer sells for $250.00 at one store and $75.00 at the other.
3. Replicas have varying the degrees of exactness (gen like vs. fantasy) different types of movement: quartz, 21J, eta vs. Asian, etc. etc.
Best answers I have, but I am sure some one much more knowledgeable will be along to add more info and correct any inaccuracies of mine.