After a certain weight "point", then the body will gain weight at an incredible pace, like a runaway train. The only solution after that is stomach reduction surgery - eating less would not cut it.
Before that point, however, there are other options in addition to dieting (like a stomach ring to constrict the amount of food you can eat), that are less invasive than surgery.
I don't know how accurate the prices are - they said the data is at least 1 night old, but who knows how often they update those things.
John, 3.01 is pretty good - here in LA, it's about 3.50-ish.
Before that point, however, there are other options in addition to dieting (like a stomach ring to constrict the amount of food you can eat), that are less invasive than surgery.