I use it bc it makes posting them anonymously much easier. On photobucket I can put the name of the maker in the title and the public can't see it. Not as simple with uploading them to the site bc once you click to open the thumbnail you can see the title (file name) at the bottom. I'd lose my mind trying to keep track of who exactly made what bc I couldn't use the makers name for the file name.
Plus I make the PB album password protected so noone can look it up to see who made what.
I do see your point and agree that it'd be nice to have them loaded into IAP. Maybe it can be addressed for next year.