In Texas fence building can be a SUPER LUCRATIVE business as far as I can tell.

I recorded albums for a Texas Country artist years back who does a LOT of house parties (post covid this was one of the only remaining income streams for musicians for a while).  This is great money for your top notch singer/songwriter type.  On rare occasion he has had me sub in for his regular drummer and once we played at a house in the "Highland Park" area of Dallas.  The owner was a man who continued his fathers business of fence building.  They did not do a lot of work in the Dallas city area, where fences are a different kind of business.  Most of their clients were ranch owners like you.  Most of the fences he built were measured in hundreds of yards (if not miles) rather than feet.

So the dude owned a construction business basically... a rather simple one really.  He did all the kinds... post and tensile wire like you show (looks like), or even metal crossbar fences or masonry.  Even the simplest construction possible will add up to an expensive project quickly because the the scale of these projects. He was LOADED.  Fence building is great business evidently!  Definitely more money to be made than playing drums...