The whole ARX thing is and should be scrapped forever into the dustbins of hell.
Why do we have to buy fake money with the other fake money?

Derp
What do they think we're stupid or something?
You don't
have to, it's for cosmetics
Presumably it is better for them (Frontier). By way of compensating for the inconvenience you can also earn a small amount just for playing the game.
I reached my 400/400 cap last night, just in time for the reset which I'm assuming will arrive with the powerplay tick.
I play a lot, and I do a lot of missions, planet discovery & mapping (all previously discovered), killing mission pirates. But I tend to save exploration data and bounties to sell tactically, and it was selling exploration data for an election that got me the ARX this week (no CZ activity this week).
Now it wasn't difficult for me to hit that target and I could have gathered & sold some data to a random system I didn't have an interest in but the free ARX rewards achievements, not 'just playing the game'. Not complaining, it's free after all, but I hope they review the way this was implemented.