I think there has been some people that has been on the digg home page that has nearly seen their servers crash due to the quick volumn of traffic. But that is just what I have heard and probably most likely due to the poor scripts they are using or something. Anyway, I have also heard that you do get a few clicks from digg users, but not many at all.
My wallpaper site (on the old domain) got 951 diggs and I ran out of badwidth within a couple of days. Recently I changed domains and tried listing it on digg again. Only have 34 diggs to date and it barely made a wave in traffic.
You must be prepared for diggers) All sites of that kind will send burst of traffic on each submittion
That's alot of bandwidth. But then it all depends on how much bandwidth each of your pages uses up once they have loaded. Some sites take up more bandwidth than others.
That's wallpapers though You should prepare for a digg by switching files over so its text based rather than images.
Not many digg users would actually click your ads but you will defenetely get a lot of backlinks on other sites. You will be suprised how many people copy diggs articles and blog about them etc
I don't think this would be a good idea. Why would he want to switch his site over to text based if the site is intended to show wallpapers and things. If his site shows these and things then that is what he is trying to promote no matter how much traffic he gets and where he gets it from. Just because there maybe a large amount of traffic I wouldn't go changing my site from a gaming site to a article site just because the gaming files are rather large. I would want people to see what the site is actually about.
The several times I made the digg front page my traffic increased 500%, but my earnings only increased 200%. Digg is good for creating backlinks and testing your server.