It also really doesn't help when you're talking about a VOLUNTEER staff and being that it's a time when lots of people are taking vacations, going on tour, trying to enjoy their summer in the free time, etc. Basically, there are a lot fewer of us around (such as I just got back from just under 2 weeks out with the family) and that equates to less hours being put in. Combine that with a more active than normal moderating segment that is asking for attention and less time (a LOT less) is going to things like new art and auction tracking, which is said since that is both the purpose and the way in which the site is mostly sustained.
To address another point mentioned, I can't say with 100% certainty that favorites aren't played in approving art, although I really think you're overthinking how we look at the submission list if you do. If it doesn't have a title, yes - I'm gonna skip it for something that in the name list looks like it has the potential to be easily approved. Wouldn't you want to make the most of your time and get a dozen correctly submitted pieces approved instead of maybe getting one done in the same time because you need to find all the info about it since the submitter gave none? Got news for ya - it happens that way more often than not. Also, if I'm approving stuff, it's normally because I have just submitted a whole bunch of new pieces by a specific artist. I know that mine have been formatted right, so I approve those first. If I finish 'em off and have time left to give, I'll look for those that are structured right first, then move down the list. Simple fact too is that popular artists or bands will get done first too - because they are just that. A new Fairey print, bands like Phish or Pearl Jam on tour - the weekly or nightly prints will be approved faster, I'd almost guarantee it.
That said, I'd suggest you look at your own life. If someone is making your life more difficult - friend, neighbor, co-worker, client, boss, etc. - are you more apt to help them out first or someone who appears to be making your job easier? Be honest - I know where my inclination is and I admit that. A more pleasant experience will get better service in return. So yes, if you're being a cause of loss of my time or energy then I may choose to go to something else first. These are my personal thoughts and approaches - definitely not the whole of the team. But maybe it gives a little insight as to the why of things. Being a benefit to the site in a positive way breeds a lot better feelings to one's self than those who bring it down... and no, I'm not some dirty hippie saying that