Let's say you removed all the variables: same nut, same tuners, same finish. Two maple necks, both old enough not to warp from greenness. Basically two identically cut pieces of maple, but one is from a 2010 US Tele and the other from a 2010 Squier. What's gonna be the difference? Harder maple on the US? Better (i.e. harder and more polishable) frets? Basically, why spend several hundred on the US rather than $100 on the Squier?