I disagree with you on quite a few different levels and, for clarity, I'll attempt to separate them out in this reply.
First of all, you've completely conflated the distinction between legal and moral obligations. Your entire argument in this post is a legal argument, from which you jump to an entirely unfounded moral assertion. Even if I agreed with your legal argument, which I don't, the moral conclusion would not follow. Since you've offered no moral argument, I'll confine the rest of my response to the legal issues.
Secondly, your legal argument seems specific to the U.S. legal system (for instance, you reference the first sale doctrine, which is specific to U.S. copyright law). In most of the world, I'm happy to note, EULAs are a legal non-starter and TOS are significantly limited by legislation. To give you a concrete and topical example, the GDPR directly invalidates virtually all existing website ToS in the EU (exceptions exist, but are few and far between).
Thirdly, even in the context of the U.S. legal system, which I am not subject to and from which I derive no moral obligation, I believe you're incorrect. The argument you propose is certainly one possible and strong objection to the legal (rather than moral) obligation to view ads, it is by no means the only one. For instance, the absolute majority of the ToS you're defending here do not force visitors to explicitly agree to their terms before proceeding further. This overwhelmingly popular class of ToS was rendered largely unenforcable even in the U.S. by the precedent of Nguyen v. Barnes & Noble, Inc. [1], and the legal argument had nothing to do with the ability of your average web surfer, but rather the lack of constructive notice on the part of the website. We can discuss other precedents if you like, as there are several, but it's clear that contrary to the picture you attempted to present, even in the U.S. legal system it is far from the case that browsing a website implies a contractual relationship with binding terms of service.
If you personally feel a moral obligation to watch ads on websites you visit, that's your business. I don't see any reasonable basis to your attempt to find a legal justification for your position, and you haven't presented any moral argument that didn't directly derive from an incorrect legal position. There are certainly moral arguments you could pursue and, although I haven't yet seen one that was even mildly persuasive, we can have that discussion as well.
[1] https://en.wikipedia.org/wiki/Nguyen_v._Barnes_%26_Noble,_In....