Thanks - we sometimes leave the blocker on here too by accident. Generally we will try not to overdo the ads so that they don't get too troublesome.
Don't know too much about the clicking. I do know you can over click them though and Google can spot this kind of "cheating". I tend to look at the ones that genuinely might be useful. e.g. on a Parking penalty thread here a load of ads came up for motoring law specialists and on their sites some of their FAQs were very interesting and helpful.
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