Photo requirements

I list on ebay.com and also ebay australia and just noticed that Turbo Lister is giving a warning message with some of my photos on ebay australia listings....


Pictures must be 1600 pixels on the longest side.


 


However, the new requirements on ebay.com seem to be very different ...


Photos must be at least 500 pixels on the longest side.


 


Just wondering why the photo requirements would be so different for the two different site.