5-8oz First Class label discount glitch?

[duffelbagbargains]

The USPS charges the same price for a 5oz First Class package as it does for an 8oz package. Why is the ebay label discount on an 8oz package less than the discount on a 5oz package when USPS charges the same price for all 5-8oz packages? 

[sam9876]

"The USPS charges the same price for a 5oz First Class package as it does for an 8oz package. "

Not any more.

[partial*eclipse]

The "eBay discount" is nothing more than the difference between USPS's retail price vs their online price.  The retail price is the same for weights of  5 - 8 ounces ($3.75), but the online prices are different per ounce.  Hence, the price difference decreases as weight increases.

[buyselljack2016]

@duffelbagbargains

USPS online rates changed Jan 21 2018