> if you're going to build an ad-revenue-based site, then do so in a field where there are major players throwing around big money on adsense or similar
It is not field based. Every company has their own bidding budget. Take any field, you will be able to find clients who are ready to pay higher CPC than avg because they have money
Not really. The same person as a customer will have different lifetime value to a company in different industries. That is dependant on the stickiness of the product, the sticker price, and the nature of the product.
Credit Cards and Insurance will always have higher CPC than florists. That's inherent, and that's what I mean by choosing the field carefully.
It is not field based. Every company has their own bidding budget. Take any field, you will be able to find clients who are ready to pay higher CPC than avg because they have money