Blackberry sets aren't that hot here.
50K is too much. You can easily get Bold 2 (9700) for 40-42K in Pakistan.
One of my friend sold 8820 recently. It was brand new, boxed, and he didn't even insert sim in it. That went for 12K.
Try to go for some other sets in HTC, Nokia or Apple brand. There you can get some competitive offers if your prices are good.