I'd have more respect for you Ian if you meant it, but of course you don't. You just go off and lick your emotional wounds for a few months and then you are back again in a flurry, repeating the same patterns that will inevitably create the same results.
I don't think anyone actually wants you to go, especially in a childish hissy fit. A much better solution would be to realise why you get the stick you do and maybe modify your message to get the impact you want, you know, like in marketing. Sorry if this sounds patronising but I'm thinking it may help.
1. Read and edit your posts before you hit the POST key. No one wants to read an unedited thought stream.
2. Go for quality over quantity. I can't understand Len either, but at least his posts are short... and witty.
3. Assume the silent majority read and benefit from what you post and those that criticise just simply don't agree with what you are saying, not that they are personally attacking you.
4. Finally. I think the best thing by far you can do is actually implement the things you bang on about, for your own business and your own credibility. There is no 'apparent' congruency between what you say and what you do on the web.
Don't go Ian, you big tart.