I am doing this on my phone, so I can't see your item.
Based on what someone said about you not posting any pics is a big mistake, you couldve at least done the stock photo option.
You also did 2 other things wrong. First of all, you did a 5 day auction which means your iPhone is going to be at the very end of the list (or damn near close to it). That means it won't even end until Wednesday which is 2 days after wwdc happens, which most likely means people won't be interested in the 3G anymore because it'll be outdated. Remember, not everyone knows about these rumor sites, but a good majority of those people that don't know will know when it's on apples website, msn, yahoo, cnet, ign, msnbc, every news station will tell about it, etc etc that a new iPhone is coming out. Second of all, you put the starting bid at $100, I wouldn't say that's a dealbreaker but it wasn't very smart.
Having said that, this is the way I sold my 3G and it worked like a charm. Not as much as I'd like to have gotten for it but oh well....at least I managed to sell it. I put mine on a 1 day auction starting at $0.99 with no reserve cuz in this fast paced world a person doesn't want to auction for 5 days, and no one will even look at it until day 4 anyways. I listed it on Friday at around 5:30PM pacific time, that way it would end at 8:30pm eastern time which is where a majority of buyers live (a person in Brooklyn bought mine). Mine being on a 24 hour auction, didn't even get looked at once until 12AM which was over 6 hours after I put it up. I included about 10 photos of all the original documentation and box via photobucket so I didn't have to pay extra. Paid the extra few cents to put a photo up on the results page, as well as make the font bold. I ended up selling my iPhone 3G 16GB in white that's jailbroken 3.1.3 (not unlocked) for $230 + $10 shipping. I am waiting for paypal payment to clear to send it out.
That's just my two cents.....