I don't like to see users browsing in guest section around 1000+ and all other section are dry with 4-10 users. I agree that having a guest section ease the work of webmasters who submit to DDL but if you put a little bit effort and submit post from normal sections after looking at the content of post will give you a lot of users in each section and forum looks professional.
Anyway it is my personal opinion.
And for uploader point of view guest section is great because they get better chance of being their post submitted on DDL