see that it allows your chakra near unlimited flow even as it destroys your own body. First we all know that chakra capacity and amount increase as you get older and more experienced, other wise no matter how much you trained you would never be able to use better jutsu, and second if you train your body and muscles it takes more to destroy them. Put these 2 together that if you have a near unlimited flow of chakra, with more chakra flowing, and a tougher body, able to keep that level of flow for longer. So if you were level 5 and used 6 gates it must be stronger than if you were at level 2 and used 6 gates.
Now if only Naruto could learn to open the gates and have kyuubi chakra flowing with his own.