You know flipping is ok, I’ve move pages around to upgrade myself but usually in a manner that I wouldn’t classified as flip.
IF you intend to quick flip, don’t come to the person holding your target page and commence in friendly getting to know you banter and butter em up, telling them that artist x is your favorite artist and would love to add that page to your collection.... ONLY to list it in the next available auction.
INSTEAD just ask if they would sell you the page and for how much. Sure you can be nice BUT drop the pretense that you need it for your collection.
People are funny, they like honesty, and as slick as you think you are the hobby is a lot smaller than you think, and we REALLY like to talk... just sayin!