The answer on the glue is almost certainly no. It won't come off. Last year LEGO gave me some display models for some work I did for them and portions of the models were glued. I had to dismantle them and toss the bits of LEGO that were glued together in a recycling bin, as there was just no hope for them. And having worked around the model builders at LEGOLAND, I can assure you that when something is glued, it is done so for good. The only glue that is removable is something like Elmer's, which you can soak in water to remove, but LEGO uses nothing akin to this glue. As to the value, perhaps someone would buy them. Things are worth whatever people would be willing to pay. Either way, it's a neat find. Good luck.