Turkeys will do whatever they feel like doing. I've seen them roost high and low. They tend to get higher though. Don't let anyone tell you that turkeys fly up well before last light either. I always believed this until this past season bowhunting. It was just about dark and I heard something walking. Must be a deer I thought. It was a turkey. It was so dark that the turkey was almost invisible.
So I take alot of things people tell me with a grain of salt. You just have to get out there and see for yourself. Animals are capable of doing anything.