You can only DE non-soulbound, non-pvp, and most non-rep-related drops(Can't de Halaa gear for example, nor the Lower City spelldmg mace I think)

You can DE your own quest rewards, but not alts' soulbound rewards. And unless you really need mats, weigh possible mat outcome price/cost versus what the Vendor will give you if you simply sell it to them; eg an 8-12g staff sell is worth far more than some vision dust, moreso when you're past vision dust. a 2g green vs an Arcane dust...I'd go for the dust in THAT scenario cuz arcane is used for a ton of things even when enchanting is done; a 4-6g green however, the sale to vendor wins out, gotta get your epic flyer somehow ;p Just make sure it's not a green/blue you could sell on the AH for twice or more that amount, like most "Of the Sorceror" gear going for anywhere from 10 to 40g, let alone blues.