As far as Curves go, I can't comment, but for plain old losing weight...anyone can do it on their own w/o paying outrageous prices. Just do situps every night before going to bed, pushups during commercials, walk the extra distance in the parking lot, eat less and basically expend more calories than you take in. Of course, it's a lot easier said than done, but I it irks me to pay someone for something I can do, or figure out,what I can do for myself. Google this ,..."get in shape"... I did and it's amazing all the free advice you can find.
It's all in the head and I'm not perfect, but if you can get into the mode, it can be done w/o high priced, pressure, gyms.