The highest you can get is 1.2 points per day. You get 0.5 points if your account has not been banned in last 365 days. If you had that bonus you would get 0.8 points instead, which is not that far from 1.2 points.
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1000 achievement points is nothing, people get more than that without even trying.
The choice of focusing only on a small aspect of the game and ignoring everything else is yours. We are rewarding players who show activity all-around, so if you want to PvP only and not even go for the PvP achievements, you're choosing to not get our point reward, simple as that.
Considering the most you can get is 1.2, I have no clue where you're pulling those numbers from.
Regarding the "I only PvP", read above.
how can people that play on wsg vote then when they have no achievments there and they play the server for pvp mostly? are they supposed to go farm achs too to get their mogs since at core isn't coming anytime soon pretty sure so how can they get mogs
transmogs I guess cause how can you make a transmog w/o at core features if there was at core no one would need vote shop from warsong cause you can mog on at core even legendary weps and cloth on leather for example but it seems at core isn't coming so I doubt people on wsg can vote
And if Warsong still had some PvE content, like it was before a certain part of the population whined against it, there would likely be enough achievements to get a higher rank. Now you'll probably just have to wait until the AT core is set on Warsong. I don't see the system being adjusted because of one server that only uses the point shop for transmogrifications - something that will be rendered useless once the core is active.