Yes.
Aura of clarity. Replenishing body. Missing focus effects. Enduring Breath. Haste. Effectively having C1 and Regen 10 that cannot be dispelled, isn't lost when you die and stacks with everything (up to the FT cap anyway) rocks.
Architect scepters and BP's mainly. Scepters when I see them for 900-1000, trade for 3.9k tribute. The BP's when I see them for <7k, trade in for 24k tribute. I check everything and if I would get at least 4-5 points for it's plat value to an NPC or the bazaar I trade it in.
Some are. Regen 4/FT2 on a level 30 necro is always nice.
I guess you could, but since tribute can't be used before 20 it wouldn't be much of twinking. The tribute haste is nice for twinkie melee I guess, and FT/Regen never hurts.