Who is unethical?
Since the ad is using my bandwidth and using my kit to be seen it is a guest on my kit. If the ad industry acted like they are guests on users' kit they might not have a the problem they are facing. I suspect most posters on El-Reg use ad-blockers but are not vehemently anti-advertising. What many object to is ramming Flash and script ads that often contain malware down our throats. Hence, the nuclear option of total ad-blocking. The lack of ethics is with the ad industry, clean up your act first, then we will consider removing ad-blockers, etc.