And even more people don't have that level.of disposable income!
My issue is not with the poster's financial choices, it is with their description of that being a 'shoestring'.
I grew up in a rural area, so was able to ride quite a lot, quite cheaply. Lots of friends had a pony or two, because grazing was cheap. They had native pony types (not pure bred) and hardy cobs, that lived out all year with a rug in winter, and some hay and a handful of hard feed.
That is very different from 10 polo ponies, not only in the number of horses, but also needing far more shelter and feeding than tough little native ponies. I don't know anyone from my childhood who would have been able to afford 10 ponies/horses.