Does Anyone Sell on CafePress or Zazzle?

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I have joined both the sites CafePress and Zazzle. These are webiste that youa re supposed to be able to submit designs to and they will put them onto cups of shirts or whatever for you and then chrage however mucha nd then you makr the item up and when it sells you are supposed to make the difference. I have a few ideas for this stuff but I have haveing trouble getting started because I do not know which site I should use, I think it would be difficult and I might run into copy right issues or somehting submitting the same designs to more than one website, so I just want ot use one. What I need to know is which ones get the most business, which ones give you the best commission on the sales they make from your designs, and do they really pay you? I am really afraid of submitting a bumch of stuff and never getting paid and loseing the rights to my work. Can anyone give me some advice on which of these systems are the best for this type of work or if there is another one that is better. I am located in Canada, and want to be paid through PayPal.