Fair for you ... or fair to the buyer?

Seriously Fred ... it all depends upon the cards/keys. Generally speaking $1 per card. However, if you have something like this one that just sold recently on ebay for over $150 this past weekend; http://www.ebay.com/itm/160681995685?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1558.l2649
..... yours is a tough question to answer.