How Often Of Do U NPC Items

i npc alot.
Anything from a exp party.
Anything that isnt worth more then 3-5k on ah

Most items are 2-3k on ah are 2-3k @ npc anyway. so its all gravy

Anything that a lolibri drops gets npc'd.

I have a mule in all the towns that will hold all my crafting items for the guilds that are in their respective town. And whenever they get stacks for Items I dont need anymore then those items go to my Jeuno mule who then sells them either in bazaar or on AH.
And even funnier is I have a LOLcrystal mule in Bastok that I used to fund my CoP static with my friends and now that we are done with that we will be using him for WotG static. Everyone picks on the crystal mule but we have never had to buy a single item for any run because of him and all 6 of us send him crystals and other such "Useless" items.

almost everyday

Some items just wont sell no matter the price.. gotten random crafting materials off of the new nm's before. Eventually just npc'd them after 3 weeks of trying to sell it on the auction house.

I only put things on ah that are over 20k. I almost always have a full AH. I don't feel like wasting a spot that could be used to sell something that is worth more.

This is also what I do too. Makes for some nice bonus gil/week.

I do a lot of ISNM and I NPC almost all the items with the exception of the pricier ones.

All crystals and other stuff from merit parties goes to NPC's belleh. I used to have a mule who sold crystals and brought in a small chunk of pocket change. I'm just too lazy to do that anymore x_x