Yeah Siouxsie, this was also a consideration of both myself and talking with Michael at DigitalCiggz. We both found that the needles plug up easily. Whether we're putting our liquid in them, or your putting YOUR liquid in them. The fact that they plug up easily is usually enough to initiate a plethora of complaints from customers that the items are doing what we already KNOW they do if we decided to sell them on our sites.
The logical conclusion is not to offer them and save ourselves the burden of grief that we already KNOW will happen if we offer them.
Because in the end, we know about the problem, and our customers won't blame the product for not working, they'll blame US for the product not working.