Trumpy, you're right. As the anchor point gets closer to the pole, the force the staywire has to apply to check pole-top movement increases exponentially. I think this is done simply to get a better fix on the stay-to-pole top by making the angle more acute, while keeping the base area of pole and stay in as small an 'envelope' as practical. This is ok, as long as the wire is stressed within its elastic limit and the anchor is firm enough to take the load.
The 'bracket' simply gets a compressive load, and is stressed-out as a strut.
Alan
