No, I don’t have heard of such a website. (Although the comment made by Shady_Shiroe comes funnily close to it.) But that is probably because all ad supported sites I visit have more than enough users without adblock to support themselves.

From a pure, real and practical standpoint you are right. For you and me and most users here it won’t do any harm to use adblock. But that only works because there are so many people who don’t. If everyone were to use adblock now, then the websites would start to either find ways to circumvent the adblock or they would not be available anymore, either because they went down or got paywalled. I’m fine with paying for some websites. But there are too many things I think are useful on the internet to be able to pay for each and every thing I see individually or via subscription.

What I want to say is that I don’t think it would be good if a big portion of users would start to use adblock so I don’t think it could be right for any individual person to do so, even if you can’t tell how many more adblock users it would take to make a negative impact.