Who is the prototype owner in question who feels this way? Dumping a prototype has very little - if any - affect on the value of it, any more than distributing copies of it does. Unless more than 1 prototype of the game exists, the original retains its value with collectors. Even rare, released games are not affected by having been dumped, copied, and distributed. The ROM images for such Atari VCS/2600 games like Air Raid, Cubicolor, Music Machine, and Video Life have been available for years, yet original copies of those not only are still worth thousands of dollars, their values over the past 5 years have either remained the same or increased.
YOu JUST got done telling him his time would be better spent doing other things...
And no, complaining on forums isn't akin to contributing.