I've sent five cards a day, about six days a week since the mail in opened in what? October? I missed chunks of time in there for various reasons but I think 500 would be a good estimate. I make up batches of them while watching TV or surfing the internet or listening to music.
So far I have won seven sets of ears and two lanyards. I could have probably bought them for less off of eBay but I'm having fun doing it!