Re: Isn't stealth adblocking possible?
Possible, yes, but it would be harder to code. Also the pseudo-blocker would have to download whatever it is and send tracking data back. Bandwidth and hate of tracking being 2 main reasons for blocking ads, nobody has felt it's worthwhile to do as yet. Simply refusing the connection, so all the advertiser gets is "111.111.111.111 says go fuck yourself" is simpler and much more satisfying.
Of course, you may have just described the next generation of ad-blockers if enough sites get on the anti-blocker bandwagon. Download whatever, drop into the /shitpit/ directory and just throw some random numbers into the tracking data returned. You might be on to something there...