Hey there - I'm the Community Manager at ABC.com - Feel free to contact me with any questions!
I haven't uploaded in forever, but I always get sales there. Not a lot of money, but usually make anywhere from $60.00 to $70.00 every month.
I make a ton more off Zazzle and if they were both the same template size I'd probably upload more, but their process to get the file ready is a pain. They gotta be a tif file, not jpeg. Some of my bestsellers on Zazzle won't even work with their predetermined temp layouts. I wish they would let us do our own layout. Using one of theirs on a design that doesn't work with it, even if the customer can change it...does not look good. First impressions are always the best.
Maybe they will see this and listen to our suggestions.
I hear your suggestions loud and clear! I'm working with our team to make our contributor site more user friendly. If you have any other suggestions please feel free to pass them on!