IMHO, for the most part,
when basting a bird, you're spreading juices, fat, etc on the largely impermeable skin, so doing it to moisten the meat seems useless. Plus, every time you open the oven it takes time to recover temp.
In a rotisserie, I would think that any juices under the skin are being distributed as the bird spins.
The bird in that pic looks delish, by the way, and I think you'd be hard pressed to get all the skin browned like that in a regular oven!
Chuck