I am in one of these so called 'desperate' niches and considering that I have been quite successful with article marketing, I know that there is rather big interest in it.
But it doesn't seem to be the case with Bing PPC. I have four different text ads which are usually displayed in 4 - 6th position... NO CLICKS so far. They seem to be better written than other ads but I admit that I may be a bit bias here.
Are you guys actually getting any clicks from PPC at Bing? In my case it has been a complete waste of time so far.