If the smiting staff was 10% then it would be considerd as perfect, not sure on a price but the purples/blues are pretty much worthless so if you do wanna sell just go to ascalon and spam something like WTS good items for starters or something like that. Then just haggle with them from that point and ask/take anything above merchant value but dont expect much more.
Yeah I know that I probably can sell the blue and purple shields around 1k-5k depending on the item. How about the gold staff though? Any hard figures?