This is a discussion question, there is no numerical answer required for it.

There is a person who is a wine lover. For about $5, he purchased a few of bottles of wine twenty years ago. Now, he could sell them to a local retailer for $100. He has a rule against paying more than $30 for a bottle of wine, but he does not sell any of his old bottles. Instead he would drink them on special occasions. In summary, he would enjoy his old bottles worth $100 each, but he would neither buy nor sell at that price.

Explain this person's behaviour using prospect theory.