No - we pay through the nose to get them in the first place, but then no annual fees are charged. I just found another site
www.numberplatetrader.com.au that has quite a few plates for sale.
Q23 is for sale for $50,000. Q3 and Q2 are for sale elsewhere for (supposedly) $400,000 and $300,000
I wonder what my Q777 plate is worth these days? It's nice to make one wise investment decision in my lifetime !