Yes OP, it does seem wrong to play for ARX.
However we the players didn't introduce ARX, or ask for it to be introduced. That decision was FD's and purely for their own financial benefit, nothing wrong with that they are a commercial organisation trying to make a profit.
I think how that was handled, how we earn ARX in game and how 'in your face' the monetisation appears is up for discussion.
FD were supposed to have released more info on how we can earn ARX in game but for whatever reason that info has been withheld.
Other games use devises like daily missions (dailies), weekly missions (weeklies), and end game content like high level dungeons/instances that take a team of veteran players with plenty of coordination to complete and receive the high end rewards, thus keeping players engaged long term....or not.
I'm not sure any of those really fits into ED, I'd also argue that ARX doesn't really fit either but I'm sure in time I will get used to it.