The original post does not say you have to purchase from RCI only spend 1000 bux.
I just received my BOA, RCI CC offer and I spend 1000 bux I get 250 bux OBC.
I bought gift cards from my local Kroger to stores that I use for stuff that I already buy. Met the 1000 bux , received 1 dollar off 35 gallons of gas.
It's relevant.