I also think that the people who "find" VSG are those that take their health and well being very seriously and are willing to do the research and the necessary lifestyle changes. That is not to say that lapbanders don't care, but many that I have known personally, have the mentality that WLS is a "magic pill", especially since lapband is considered "reversible". Somehow that is confused with not as serious and therefore they are often less invested in making the big lifestyle and behavioral changes. A passive vs. proactive approach if you will. (Disclaimer: I am not making any judgements about anyone elses personal decision.)
Edited to add: And Jane made a good point about the subgroup of successful lapbanders who have so many food issues, they are forced to eat a high carb diet.