Certain common legendary items are often used, and there are actually lots of items easily obtained that can do quite a bit. So in down time you can gather a few, hold them in inventory, and shift it when you log back in. For me it was something to do in downtime as a rager, gather some items. With about 5 (veil shrieks when you sac items) of them you can make the veil thick from normal, if not less. But doing it while there are other things to do, nah, most villagers I saw don't bother, or use things they loot from corpses. And people that bitch really shouldn't, since saccing to tahren, they can go and get them back fairly easily if they want to depending on what they lost.

And from what I can tell, rager powers seem to last longer when the veil is thicker, and mage ones do when thinner, of course I could be entirely mistaken but it seemed thin veils my resist would be like 5 hours where as thick it would be like 10-12.