The term chain in this case usually refers to the measuring instrument rather than a unit of length; the distances measured with such an instrument are normally measured in feet (and usually decimal fractions of a foot, not inches).
Messages: 7,549. Likes Received: 4,600. For the record, Disney did try to sell lifetime passes at the Magic Kingdom the first year it was open (1971) called a Gold Pass for $100. This pass was said to be good for a lifetime and for any additional parks that they may add in the future.
The price to get into a Walt Disney World theme park has increased almost every year since 1971, and now, a one-day, one-park ticket to the Magic Kingdom costs $99, making it the most expensive Disney park in the world.