Depends what you do with it. If you sell blog posts or advertising, you can do quite well. I made about $300 a month for the last three months on one.
You can make good money on them - I've got a couple that make $100 per month every month. You could easily do that 10 or 20 times.
something near $10/month on my first micro niche marketing test... I am planning to do it seriously and make more, but not with blogspot
I got one doing 50$/month with about 7/8 posts, of which only one makes the 90% of the sum Thats when I found out what the expression: "Content is King" means. I'm doing a whole site on the same niche as that one post, but I not sure if it will make more by doing it on a .com site or blogspot.