Turkeys and deer love beech nuts. I have a small stand of about 20 Beech trees at the end of my wood lot and in late October, the leaves and duff will be all scratched up from the turkeys hunting for beech nuts. (of course they are long gone come turkey season.) American Beech is not particularly in demand as a lumber tree, but is popular among hobbyists and wood turners. Beech wood flexes a lot even when cut and dried into boards , which limits it's uses. Expand yard=grass seeding and mowing. I would keep the trees. A local wood turner's club/members might be glad to take the wood away for you. Don't know that you could sell it, unless there is a specialty mill nearby that has a market for "out of the ordinary" woods. There are a few such mills in PA, like Groffs in Southern Lancaster County.. Depends on how big the trees are and how many. Groff's sells a lot of odd domestic woods but does not list any beech. However, there are about 200 listings for beech lumber for sale on ebay.