Simmilarly, why are the superheros confined to their home city
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DC hero's are not.
The justice league. Raven has appeared in Gothem and calls it her home-town. Superman has paid it a visit.
Batman has appeared in Metropolis to fight brainiac and the Hive alongside the Teen Titans before.
DC Universe:Online is fun and addicting. Free to play for ps3+pc users. Has all the major DC superhero's and villians. Can choose to be good or bad. each has its own reward. good story line.
I went with a hero, death stroke build. with one-handed and rifle's being my weapon build, along with gadgets and batman as my mentor.
Im currently decked out in Demon-armor, after doing raven&the teen titans missions, along with zatanna,docter fate, cyborg, and ravens missions against Raven's father Trigon.
In DCU, Trigon's influence reaches even Gothem, where his followers take control of robinson park, surfacing the pillers of Hades in an attempt to open a "Gateway to hell" in the middle of gothem for Trigon to transport to earth through.
The teen titans never went to gothem as a whole in the comics, but they do in the game.(along with donna troy).
Granted, alot of stuff doesnt make sense in the comics, but some DOES.

Edit: as to the internet batman thing, im willing to bet he carries on him some sort of jammer, which prevents cameras seeing what he doesn't want them too.