I agree. I was stunned to find out there are only 2 ad blocking utilities for iOS, and both don't work the best according to reports. One of them apparently requires jailbreaking to work correctly. (I doubt more than 5% of QB people would be in a position to want to do this.)
The admin could easily look at the stats and see what percentage of their traffic is coming from an iOS device. I think it might be eye opening, it sure was on my sites. Even just from "safari" would open some eyes.
For Android, AdBlock Plus has an app already. I'd go with what I'm used to. In fact, maybe I'll just go install that now, since I may find a need to tether to my phone one day and it would be nice to have it already installed.