the problem with nibble is that it is way too slow. I mined some and got my shares only after 15 hours. forget it.
you are doing something very wrong then , what is your # ?
if your # is very low , then i suggest to buy some , this is not WDC, this will be here next week , next month , next year.
you don't buy now , just remember this post. all the times I have told you people .