Well people do have to hit the DNS servers first
But I noticed this subject on the newsgroup also. The only time they will change STM to more reasonable percentages or drop it from a specific site, is when customers declare their dislike over it.
And as ive said, the 5% excuse is to put people at ease when they phone up and have no idea whats going on so they dont feel targeted, when in essence everyone will get throttled if they overstep the limit.