My guess is that those who have the best success with restrictive programs are also pairing them with a mindset of opportunity and possibility. They're not just giving up booze or Starbucks for 30 days; they're making a concrete plan for what they'll do with the extra money and time they "find." They're mentally filling the void left by the limitation, so that they're running TOWARD toward something they want...not just AWAY from something they don't.