I think secrecy around tiger traders is more of a thing with RCI. At least that is my take from reading the forums over the years. Best MF/TPU or MF per RCI point. People don't like sharing what they know.
I think people on TUG that like to game things spend more time trying to crack the code of II trading value.
I have had some good discussions on TUG about good traders in RCI weeks, and it all is pretty much an open book for anyone wanting to research it.
It is easy to get on TUG2.com or Redweek and other sites to find out how much maintenance fees are. Anyone with an RCI weeks account can go to the deposit calculator page and see how many TPUs any week at any resort will yield.
I know some people keep secrets, and I don’t blame them even if that is not my style.