I will start with SBR's 2 sharpest posters to give you guys a ceiling...
Rudy Ruetigger $180
rm18 $164
These Two are the Creme of the Crop so don't expect to be worth more...
For example, entertaining posters are valuable, but in the end they attract douche bags that will ultimately clutter up a site and ruin it...
This is why I value JJGold at $125..