This is the point missed by many. The trades are in high demand, right now, because of a labor shortage and demand from upper-middle class individuals without any DIY skills. A generation or two of pushing kids into college, and an almost disparaging view of 'getting your hands dirty' has built this perfect storm.

However, besides a few trades that use unions/licensure/apprenticeship as an artificial supply limit, most trades are only limited by a willingness to do the work. A few decades ago, trade work was much less expensive, because supply was higher and many did their own DIY, which limited what prices the market would tolerate.