Those blue weapons are pretty easy to get. A few runs through each k6 and you ought to have had the luck to see them drop and probably win them. However, most are just filler weapons until you get a raid drop or buy a faction purple weapon; few are so good that you'd prefer using them over raid or faction purples.
That being said, it still would be too easy if they're purchasable with only moas. There needs to be some effort put into the game to get geared, so maybe 36-48 rares and 96-120 moas each. And even that seems easy - a few runs of HoC, Refuge, Isle of Iron Statues or Dead Man's Hand can get that in just a few days.
Yes, vanity weapons would be great to have.