Power Seller status is a reward for good performance. It gives you a certain "cred" that may be valuable in raising Buyer's trust.

If you don't want to be a Power Sellert, then stop selling on that ID and start another ID. It costs nothing, and then you can get your 50c discount on listing fees.

Or you could open a Store and get 20c listings but only pay 7% FVF on general items, rather than Free listings and 7.9%.

I certainly know what I prefer.