I think what you may be missing (I'm guessing from reading your posts) is that Aramith has tiers of balls - the low end you linked to is WELL below the quality of the highest end of Super Pro's or Brunswick Centennials.
Settling for "low end" Aramiths or Cents, as you put it, is like saying you'll settle for a new stripped down Chevy Aveo or a loaded Cadillac Escalade (they are both made by GM). Two TOTALLY different animals. So, Super Pro's and Centennials = higher priced (because they are made of better materials, and are more precise in their construction), and lesser priced balls = made of decreasingly lower end materials, and aren't manufactured to the same standards......hence everyone telling you you get what you pay for.
I personally have a Aramith Premium ball set with a red circle cue ball, and they are fine (a step below the highest quality, but still better than the Aramiths in the link you provided). I bought my set NEW when I got my table, and they were $50.
I know this is a long read, but hopefully you didn't lose interest after the first couple of lines, and picked up on what everyone else is trying to tell you - lol