incrediBILL - 4:26 am on Jun 2, 2012 (gmt 0)
Sure you can stop those bots that want to be stopped. You assume that the scrapers won't use standard browser user agents which is what many that don't want to be stopped do.
Not sure why just AdSense IDs bother you as you can also be tracked with whatever 3rd party analytics or any other tracking or ad system you put in any of those pages.
Basically, if you don't want people to know what you're doing, don't post it online.
It's really that simple.
Besides, what kind of hobby sites are you posting that are so embarrassing you don't want people to know about them?
Had to ask.. ;)