Now a reminder - I HAVE NOTHING TO DO WITH THE SALE OF THESE THINGS!
I bought mine for $35 from some guy who was selling them on another forum. In my opinion it is a great product. Also agree it's expensive. Quality is "job one" and I'm proud to have one.
I see people proudly spending literally thousands on throwing away the factory tires to replace free tires with others, hundreds to illegally tint their windows, painting and adding decorations to their trucks with no real practical value.
Mine seals off the top of the open fuel cap above the second flap. It will keep rain and dirt out of the fuel tank. That's practical and this is a "neat quality" item. No idea if that ad on Ebay is selling the quality model I have but it looks like it.
If I remember close to right, when they came up for sale maybe 30 or more of us bought them eagerly. All feedback was positive and we were satisfied.
I don't feel "there's a sucker born every minute". This thing works and corrects a problem with a measure of class.