I think the idea behind the GDP is to discourage using the same tactic all the time (LI), and I think it's very succesful at that. If using it is a pure gamble, it has achieved its goal. If that means no-one uses it, that's great because the situation is the same except the tactics that are used are more diverse, which was the goal. If people still use it to gamble, the will get burnt more than not so use is at own risk. I see it as an option to go all out when you are at a disadvantage and need to pull a miracle. If you're right you have a chance, if you're wrong it's no big deal because you would have probably lost anyway.