the reason 10 Accuracy in an Accessory slot used to cost so much because back in those days, Accuracy was a pain to cap, And a lot of good Melee Haste Gear did not offer a lot of Accuracy. Today, Its hard to find haste gear without accuracy. Take Raider's Bonnet+2 vs W.Turban. +12 Accuracy. Raider's Body? +10DEX(5acc) +5 Dagger skill (~4 Acc) as well as 5% Haste.
Accuracy is already piled on so much natural Melee gear, the need to sacrifice slots for Accuracy is relatively low. Its not that the stat is not important, its that the gear we wear normally generally has more accuracy than we know what to do with.
Back in the day, Dusk Gloves, Haste, No accuracy
Today - brego Gloves - Accuracy+5
Back in the day, W.Turban, Haste, No Acc
Today - Pretty much every haste head ever - Acc or DEX in large amounts.
Back in the day, Accuracy was hard to fill in slots that didn't sacrifice haste, SO accessories were the big spot, Today, Haste/Acc are Love partners, So the value of needing to sacrifice accessories for Acc is diminished. And with the support most fights offer in Stalwarts, Bravers, Atmacites... Accuracy heavily needed is further diminished.
I hope I'm making myself clear here. I'm cutting a lot of my train of thought out to make this short.