no you really dont have to pay for every pic.
it uses a little bit of html code.
when you go to list your item use advanced instead of basicl.
enter all details as normal add your description and everything then when you wish to add more photos, click on the html tab of the description thing.
hang on ill find a pic.
ok once your on the html tab everything will look a little confusing if your not used to it.
but fear not, enter your details and everything in standard mode which you will be used to and only when you are finished and wish to add your pictures click on the html tab.
goto the bottom of all the text in the window.
and use this code.
<p align="center"> <img src="http://image-shack.us/photo-code" width="600" height="400"> </p>
you can use image shack or photobucket or any image hosting company. aslon as you change the http address.
so where http://image-shack.us/photo-code
this is change that to your photo url.
hope this helps and hope it wasnt too complicated.
Edit. ignor what it says about holding ctrl then pressing V i just wanted to shjow you the html tab