What is your most valuable card?
'Value' or 'Valuable' is a subjective term like 'beauty' or 'pain'. Or trying to describe a color to another person - it all depends on your particular perception.
What I think of as painful you might brush off as nothing. Something that you think is plain - I might find beautiful. It really does depend on your point of view. Strictly measuring the value of a card based entirely on a price guide is an extremely poor method of valuing your collection.
If that's how you honestly value your collection - allow me to make a prediction: You'll grow tired of it one day. And on that day I'll be waiting - money in one hand and checklist in the other. <g>
However, if you're interested in some of my Favorite Frank Items please click here.