Because that's not the field of work I chose for myself. I do see construction workers on a daily basis though. I also know the owner of a construction company, he's part of my extended family. The wealth disparity between the workers and my family member is obscene. There's no way I'll ever believe they couldn't be paid better wages.

There’s a very large nearly endless supply of laborers that can do this type of work though. The more niche your skill set the higher you can demand in pay. This is economics 101. You are putting this into a moral space that doesn’t reflect economic realities.

So? There are so many economic realities which we explicitly disallow. Monopolies, for example. Why should this exploitation be allowed to go on?