I am sure I make plenty of mistakes when I post here. It's not because I don't know the right word/spelling, it's because I type really quickly, whilst watching TV and thinking about other things. I don't proof read because it's a 'chat board' and I can't be arsed bothered.
I used to proof read (for money), but don't any more, I think I spent too much time on MN and thus don't 'see' the mistakes so much anymore! That's not to say I don't get the urge to correct some things - but I only ever do that to posters who are being complete wankers!
I'm sure most of the pedants would like to shoot me 