Currently, rhodium sells for $450 over spot for a 1oz Baird & co bar at Goldstackers. If the same, sealed bar were put up in the classifieds section of SS for say $100-200 over spot, would there be buyers?
Rhodium is currently on bid at US$1285 but ask is US$1385 (Kitco) which is about AU$1562. Rhodium always has this big spread between bid and ask. BB is selling bars at AU$1670 which is about $100 over asking price. The local price adds another $160 for GST. Not sure what you are on about $450 over spot ?
As Rhodium prices are not regularly updated you may find the price is out of date on GS site - call them up.
Problem with Rh is GST like Pd. I think it's a gamble but there is a lot of upside potential. Remember Rh was $10k per oz a few years ago. Nothing wrong with a few oz just for fun.