Would lke a bit more data points on this.

My experience has been nil other than where I as SE snag a seat for my wife as an E or P when R space opens up and I am on the waitlist. (then I have priority when more R opens up or at the gate if I have to wait)

Both of us were waitlisted YYC-PHX as R=0. I eupgraded to the waitlist my wife first but my eupgrade cleared first so now it is still R=0 and she is still on the waitlist (now she has lower priority if it comes to a gate fight). I thought eupgrading was done in order of time that request was made but obviously not.