JulianneW this is a quote from the site you linked.
"Most people infected with the poliovirus have no signs of illness and are never aware they have been infected. These symptomless people carry the virus in their intestines and can “silently” spread the infection to thousands of others before the first case of polio paralysis emerges.
For this reason, WHO considers a single confirmed case of polio paralysis to be evidence of an epidemic – particularly in countries where very few cases occur."
So 41 cases of confirmed polio paralysis from indefenate number of people who got sick and spread it to others. In 2009 there were 694, 2008-82, in 2007 -984. If one in 200 polio carriers gets paralysis and is used for statistics it means that in 2010 there were 8200 people who got sick and were able to spread the virus and in 2007 there were 196 800 who were sick and passing virus, which makes a chance of contracting Polio much more significant.
Other thing as a tourist to third world country that you need to keep in mind is not only yourself following basic sanitation but also making sure that everyone one you came in contact with done the same. Which is very difficult in the country where general population lacks understanding of basic hygien and sanitation.
My dad is a Health Inspector in NYC and according to him there was an outbreak of Hep A (which is spread like polio) that was traced back to bartender in high end pub, who had Hep A and did not wash his hands. How did he transfer it to others? By handling their drinking glasses and hand-squeezing lemons into their drinks. It was a high end pub in NYC. The biggest issue my dad finds during his inspections in restaurants and street vendors run by people who came from third world countries (not that american born people are much better) is lack of understanding of basic sanitation. I am not going to go into detail of what he finds there, my point is that even in NYC you have people who disregard or don't understand basic sanitation, you can not expect others who live in coltures where whose things are not common, that it would be better. Unless you personally handle all food items, cooking and serving utensils, you can not be sure that basic sanitation was followed and you are not exposed to the disease. Besides Polio there is a lot of nasty bugs that you could get in the same way.
Also in case you get sick with something, you might want to know how you will be treated. For example if you were in Russia and got diagnosed with Hep A, it is a standard procedure to be put into infectious disease hospital for a month, even though there is not treatment. I don't know how it is in India, but I would rather avoid getting sick on the trip and having to deal with local "treatment" methods.
It is OP personal choice if she wants to take the risk or even consider it as a risk but I personally do not think that it is wise to take unvaxed children to the country where they have significant chances of getting sick.
If there is no absolute need for you to go to India, don't go there or at least don't bring the kids.
We had not vaccinated our DD because we wanted to protect her health and living in US her chances of getting a life threatening form of vax disease were less or equal to her having a serious reaction to vaccine. We were willing to take a chance. Now we moved to Germany and will be going to Russia in the summer. Our situation has changed and her chances of getting things like Diphtheria and risks related to it are greater than risk of vaccine reaction. I still want to protect her health and it is why she will get DTP vax.