when do they expire
Another issue to consider when pricing your points is their expiration date. By listing the points at 1 penny per point you will be competing with everyone, and so your points might take long to sell, or go unsold.
If your points are close to expiring you may want to price @ less than a penny per point ( .6 - .75 pennies / point is a good deal. and .5 penny / point will ensure your points get sold quickly.)
In some cases, trying to squeeze every cent out of your points may in the long run result in your being stuck with expiring points.