I love doing blog tours. They are a lot of work. First you have to write something interesting for the places you are going to be blogging on, then the day each blog comes out you need to promote the blog at least on Facebook and Twitter and any other social networks you might be on and also any of your listserves. This takes a lot of time.
It is also important that you check the blog during the day so you can answer the questions commenters asks, plus acknowledge each one who asked a question.
One way to see if the blog tour is working is to check your stats on Amazon. One day while on my blog tour for Invisible Path I checked during the last blog tour the stats for the trade paperback were 728,581. The lower the numbers the better. I know that doesn't sound low but it's a lot better than the million plus that the books began with. The Kindle version was even better at 201,739. How this will play out in sales I have no idea. What I do know is when I do nothing, the numbers remain in the millions.
Of course the book is sold other places besides Amazon. A good place to purchase Invisible Path and any of the other books in the Deputy Tempe Crabtree series in either trade paperback or e-book is directly from the publisher at http://www.mundania.com
Any bookstore can also order the book too.
In my opinion, doing a blog tour helps sell books so I'll probably keep right on doing them.