Recently I was travelling with friends, and of of them was a vegetarian. And I found that these people really have ’special needs’. You should think that it’s possible to go to just any restaurant and just order something vegetarian, but in reality it’s not that easy. Because if everyone else on the table is fully enjoying their meal, and you are kind of putting something together that consists of several side dishes, and it’s not really what you want, that makes you feel bad.
So if you can make “Vegetarian City Guides” that would hit their absolute sweetspot. And after experiencing my friend… I’m absolutely convinced that these people would shell out money for that.
How much research would it take? Well, let’s take London…
http://www.google.com/search?q=london+vegetarian
Now, if it’s that easy, why would people pay money for it? Because 1) many people still aren’t that web-savvy, and 2) if you “package” the information nicely, and make it even into a book-format (on demand printing anyone?) that’s gonna be of enough additional value to them to be worth it. Add some fotos, summarize reviews, etc.
There’s many ways how you could up the value on that, just let your imagination flow.