Now, when you do this, it is important make your intentions clear--"I am not here to say 'You guys need to shape up and do this or that.' I realize not everyone shares my passions, so I am simply saying that I would love to serve by bringing my gifts in this area to bear for the sake of the group." One of the main reasons people are hesitant to accept contributions from people who are "different" is that they think they are being asked to become that way or do the work themselves. On the flip-side, one of the main reasons people who are "different" are hesitant to make contributions (or even stay in the group) is that they think the larger group is going to ask them to homogenize.
Of course, I realize that there are some groups that are completely resistant to anyone who is different. If you find yourself in such a situation, you will constantly feel drained--like you are burning all of your gas just spinning your tires in the mud. It is important to recognize that these groups are the inevitable result of a "be like me" mentality. In these cases, it is perfectly reasonable to move on. But beware of the desire to move on to a place where everyone is just like you, lest you become a tooth in the jaws that just bit you.