All this talk of SWG reminds me of the time me and a few randoms crawled across the entire surface of Tatooine (apparently a popular past time from what i heard), it took us a very, very long time,(such a long time that some of the people we met at the start logged in hours later and caught up with us on their speeders and bikes only to find us just barley making it to the next settlement) it was one of the more amusing things I've done in an MMO and the dozens of people cheering us on and actually coming back to see our progress was an amazing experience in what a good community can be like.
I can't comment on the actual economy aspects of the game because i think i quit a short time after i started because i was already juggling a few subs at once but i'll mention EVE because of how player driven the economy is, for those of you who play and know of "Jita" and the "burn Jita event"
(for those who don't: Jita is arguably the largest trade hub in space, billions worth of ships, equipment and minerals are traded daily there, and "burn jita" was a player event caused when one of the biggest player alliances in the game "goonswarm" entered the system and started shooting up the place, while smaller ships could avoid being caught up the much larger haulers and freighters that are used as transports with their massive cargo holds couldn't and were shot down effectively cutting off a large portion of the games economy for a few days) this was all player organised and planned, it got so dangerous for traders that are active in the system that the devs had to place a travel warning on the log in screen, i'd also like to add that this system is one of the games "protected zone" where open PVP results in the offender being destroyed by local god mode police forces, even with that protection provided by the devs, players themselves turned it into an extremely bad place to be
i'm hoping places and things like this appear in PFO as actual player created trade hubs, and when this games equivalent of goonswarm decides to shoot on site every one trying to get into the trade hub they will also burn down the structures meaning that another hub can be made from the ashes or already existing hubs grow larger or even entirely new ones are formed.
TLDR: Sand boxes have the potential to be the most entertaining gaming environments where the players have the ability to shape the world as they see fit, these things are impossible in "theme parks" and in some cases will actually result in you getting banned for not "following the rules"