I found some more:
Having had a good nosey round these sites, and squirreling through others, i've read some pretty interesting things. There was one response that was 'oh, yawn, that's so like 2005. I'm so over it'.
I have many reasons why i do it - the main reasons are:
1. to show people that knitting isn't just for nanas, and the traditional perception of it being boring is well out dated. I knit because it challenges me, makes me think, and allows me to make beautiful fabric. Knitting tags is almost all i do now because i can try out new ideas, play, and make mistakes.
2. to show the 'boys' with the spraycans (and all 'traditional' graffiti detractors) that graffiti also isn't what it used to be, and that girls should have just as much kudos for what they do in the field. Graffiti is art (i won't go into detail about where i think the lines are) and so is craft - something that has a rep for not being 'art' either.
We're challenging stereotypes. OutdoorKnit didn't come up with the concept, but we like to do our part. Plus, i'm all about the positive - we need to encourage each other to try something different, to be ourselves, and explore our environment. Whatever that may be.