I doubt you'll get near what you paid for it unless you bought it used originally. I actually brought my road bike to a shop yesterday to see what they'd give me for it. They sell lots of vintage road bikes and I built mine to roadrace when I worked in a bike shop in 1974. It's not worth even half of what I expected, so I'd rather just keep it or if I needed the money, part it out (full Campagnolo, so there is a market).
I have kept our other bikes (wife's mountain, my mountain) and our kids have used them as they've grown up. But their interests have been different than mine were. BMX, downhill, dirt jumper have been more their speed.