We do need moonstones, and from all 4(elysian, soulstone, sacred, moonstone), moonstone is the most expensive, i have 2 friends who do that 6v6 everyday, they get all the gold they need from selling moonstones, they dn't run dailies or events(except for HR cuz they've good clan) cause they really don't need it, since all they need is do 6v6 and get toons of gold from selling moonstones.
PvE players also need moonstone, sealed or crystals.
Right now i'm in need to craft 8 Empyrean Stones, and i'll need around 50 moonstones for, not to mention the 160 moonstones needed to craft transformation stones for GC upgrade.
then please, don't say we, pve players don't need to touch pvp, because MOONSTONES are locked behind it.