I don't think stopping buying from Elbox would exactly encourage them to relase new products, do you?
To (mis)quote a famous American comdian, "That's the most ridiculous thing I ever heard".
Granted, their customer liaison is not the best, but they ship products quickly and they do exactly what it says on the tin.
It's also a cost effective (for Amiga anyway) way to get decent graphics from amiga. Have you seen true colour photos on Workbench?
Write to tehm and complain, by all means. But to raise a petition for everyone to stop buying? Don't hold your breath!