I agree with you that clickthrough rate is a far more useful metric for advertisers, and is probably more widely used in sponsorship deals.
Creators faking impression metrics would be followed by the advertisers seeing weirdly low clickthrough ratios, seeing that somethings up, and the creator losing future deals from that advertiser, so it’s not something I would expect creators to do unless they think they’re smarter than multi million/billion dollar companies advertising departments.
Where does this assertion come from that people that use sponsorblock are somehow never going to buy products? People keep saying it but I just don’t get it. We live in a world where people buy things. Some products are relevant to some people and some aren’t to other people. I use sponsorblock and adblock, and if I were to somehow see an advert for a product that seemed like it perfectly fit a need that I had, I’d definitely consider getting the product.