To the last question, that is correct. After I opened our store adn set up the store profile is when I started seeing values in those fields. I did not think they would effect the listing as we always specify calculated shipping.
I did an experiment, I created a blank inventory item with only a category specified. investigated the shipping options and there was no monetary information anywhere, looked at the auction lot and lo and behold... there was the same values in the three fields.
Quite baffling i would say. created another A/L from the same blank item and this time checked "dont specify shipping cost and there they are again, 6.50 shipping, 4.80 addit, and 3.00 insurance