Do your pictures measure up?

I just received an email from ebay with the question "Do your pictures measure up?". It goes on to say that the pictures should be at least 1600px on the longest side (recommended). Thats all fine but the problem I have is that Turbo Lister resizes and compresses pictures.

 

When they are loaded to TL they more than meet the requirments but when they are uploaded to ebay they are much smaller and compressed. I know this has been an issue for a very long time but just wondering how others deal with this.