like so many other things "it's personal preference" you're supposed to do it the way you are comfortable, it has become a novelty to make things from selvages. I'm saving mine but they are in bits and pieces, after I cut mypieces from the strips or whatever, then I remove the selvage, I cut the selvage off first two times and both times my piece was a wee bit too short for one more piece, so I had waste. Now I cut all my pieces and if there is enough left on the selvage to be useful I save it, if not I chunk it.