Create a website just for vegetarians and offer a membership to them. Vegetarianism is more than just what food they eat - it is a part of their lifestyle. You can offer articles, tips, ideas, affiliate products, and more. You should charge about $100 per year per membership. Offer a forum on your website where vegetarians can discuss various topics.

If you are not sure exactly what a true vegetarian is; it is a belief or practice of people that choose not to use the flesh of any animal (including water or sea animals) in any way. You should be aware that there are many different practices of vegetarians also, some will not eat anything that has a face, and some restrict using or consuming even products like eggs or dairy.

Some people that refer to themselves as 'Vegans' won't wear products of clothing or shoes that are made from an animal, for example; leathers, silks, and furs, even though the animals may not be harmed or killed in the process. These could include products like dairy, eggs, honey, silk, and even down feathers.

There are many different reasons why people choose to be Vegetarians, some including religious, cultural, ethical, environmental, social, economic, and health concerns. Whatever the reasons, many people practice this choice and we could offer a website just for them to use and enjoy. According to surveys in the United States, they have found that roughly, 1-2.8% of adults eat no meat, poultry, or fish. This means that there is a huge population that could have a great deal of interest in becoming members of a website just for vegetarians.

As noted earlier Vegetarianism is more than just what food they eat - it is a part of their lifestyle. Setting up an informational website just for them offering articles, tips, ideas, affiliate products, recipes, and more could be the basis for a membership site that could be popular and successful. You should charge about $100 per year, or $10 a month, for a membership.

Make sure that you also offer a forum on your website where vegetarians can discuss various topics. This is an excellent way for people to express their feelings on certain issues, which others may share with them and a way to make new friends with similar lifestyles and interests.

This will require you to keep up with all the issues and articles in other parts of the media brought up on a regular basis and take care of your website, so that it will always be on top of these new ideas and news worthy issues that are coming up on a daily basis.

Always offer new and exciting recipes on a regular basis too. Just like most people, we are stuck with the same old recipe ideas, and are constantly looking for something new and tasty. This can be a fun idea to encourage your members to share in also, offering prizes for the best recipes, and/or, letting other members vote.
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Resources:

http://allrecipes.com/Recipes/Everyday-Cooking/Vegetarian/Main.aspx

http://www.vegetarian-nutrition.info/updates/vegetarian_diets_health_benefits.php

http://vegetarian.about.com/

http://www.vrg.org/

http://www.membershipclientpro.com/