BTS and MRT only run through the city inner area, but usually people have to travel from the outter city into the city. There is no BTS or MRT station where i live, so how do you think that people around here get to central world? they drive! even though there are BTS station toward saphan taksin, but if you have to drive to get to a BTS station, then most people would rather just drive to central world anyways because there is no where to park! and Thai people are most interested in personal cars rather then mass transit because it makes them look wealthier. I personally prefer BTS very much because it takes only 15 minutes to get to Siam paragon ranther then 2 hours.