No value for card in collection - USe the cost just in personal collection?

Hello,

Some of my cards in my collection have no sales date. 

Please can we have an option to use the 'cost' of the card as the value that is used in your own personal collection until the card has sufficient sales data? This feature would only use the cost value inside your own collection and not site-wide as the true value of the card.

This would then help your own personal collection have a more accurate total value. As of right now if 50% of your cards have no sales data then your collection value is way off!

Thanks
sctcards