I think they went in with that first batch as a test run...they were low cost(except for the Polo Grounds....they wanted one or the other...Ebbets or Polo) to see if they could come relatively close to keeping it going.
Not so close.
I'm not sure how close they could come to trying to resemble some real old time stadiums without getting "in trouble"...but that would work for me!
Just gotta keep asking.
M.K.
Knight165