1. A computer-implemented valuation method for a data field of a data object, the method comprising the steps of: receiving a proposed wager from a first user comprising a predicted future value of the data field at an evaluation condition; receiving a counter-wager from a second user against the predicted future value; monitoring the evaluation condition; and upon satisfaction of the evaluation condition, determining a current value of the data field, comparing the current value to the predicted future value, and declaring a winning party between the first user and the second user based on the comparison.