I've asked around a bit and the information I've gotten from most users has been along the lines of 300 points is something like $1. I also received a message from a very nice lady who says shes been trying to win dice on listia for a while and they generally end 1000+ points, which is about right for most sets if 300 = $1 and most items sell for half-price or so, which appears to be the trend from things I've been watching.
Wow!! I did not know that! I am a pretty new user so this is good info. But see,l I had always thought this Listia thing was so we dont have to think of things in $. Guess I was wrong. I will just have to see what the bidding goes up to.