Below lies my response to a question posed on an email discussion group about the way we respectively feel about the whole "thrill of the chase" phenomena.
The thrill of the chase exists because of the attractiveness of the forbidden fruit. The more mysterious it is, the more curious we are. When someone is seemingly unaffected by our charms or presents a challenge more or less we find that attractive because there is a high in proving yourself to be the best/worthy, especially when your pride is involved. The mirage, in its fleeting glory carries more value in the area of fulfillment than the realization of a butterfly that lands in your hand, sans the pursuit. The appeal lies in the reach, not the receipt.