I have one of those. I spent most of my life confused why when I scratched my left ear, it made a waxy feeling in my throat and made a horrible smell, but nothing like that happened with my right ear. After I got married, my wife asked if she could "pop the pimple on my ear", and she squeezed around that sinus and it oozed this horrible white goo.
If my math is right, the 50W difference, at my power rate of $0.15/kWh, will take 2666 hours and 40 minutes to make up the $20 difference in price.