I've been selling on CafePress for several years with good results. It's one of my income streams that brings in a hundred dollars or more per month and I haven't touched the store in quite a while.
I have about 100 more designs to upload if I ever get the time.
Updating my store is on my list of tasks for summer so it will be ready for the fall/winter buying spree.
You can see my store at
http://shirts-mugs-hats.com and you're welcome to purchase anything you like!
I've never had a problem with them and their customer service has always been first rate.
But, like all marketing, you can't just create a few items and wait for them to sell. You have to actively promote your products. I would probably earn more if I added new products on a regular basis and did more promoting of what I have in my store.
Act on your dream!
JD