I've thought about this. However, since over 30 per cent of visits to my photographedublin blog come through the Blogger referral system, I tend to be comfortable there. I don't have a business blog, so do not go hunting for visitors. I'm not quite sure what a "niche blog" is. Perhaps you could give some useful links, if you have a moment, Blacknight.Niche blogs are a great idea, though I'd recommend you get your own domain name.
I've revamped an old personal site that used to live on blogger and is now in a new luxurious wordpress home. It's photography and digital artwork - I'm still moving things over from the old site and I'm still putting links in, if anyone wants to exchange, let me know.
Jennifer Farley Photography & Digital Artwork
all the best