-And Why?, or if you dont, Why not?

I use them. Vanes stick to them easily and they just peel off if you want to refletch. They're cheap unless you want custom ones and I think that they look better than bare shafts.

I have wraps so that the vanes will stick and better visibility.

I also use wraps for the same reasons above.I also use wraps to get the correct FOC.I cut the wraps as needed to achieve this.

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7" is 18 to 20 grains.

Some arrows I wrap and crest,others I'll do a cap dip and crest.Wraps are a bit quicker and and more convenient.
Wraps

Cap dip and cresting

I had wraps on before, but have removed them. Just didn't see the need, other than asthetics.

Sweet looking arrows JimPic.

I do, they look good and like said above it makes it easier to take the vanes off when you want to refletch.