Not having a go at you or anything but 10km/h over the speed limit is a fair bit and to do it three times consecutively you must do a fair bit of speeding, so what goes around comes around I guess. It's one of my pet hates when I'm going the speed limit or just over and someone comes flying past me, especially 4WD's it's not like that extra speed is going get you anywhere faster.
If your worried about points and loosing your license you could always pass off some of the points to someone else. You won't have much of an argument in saying 'if you knew you had the previous fines you wouldn't have speed' because that just proves you had intent to speed.