I think the phenomenon I observed/charted (price of Melon Brains winning bids going down by a sizable portion on average after the footage went up, with the English version still going for more than the Japanese on average due to language barrier) only happened because there's not much to "play" in Melon Brains - it's more of an interactive video than a game, so you're really not missing much just by watching it all on Youtube. Combined with a very small number of interested buyers to begin with, which probably made the effect more dramatic. Or, it could've been merely a freak fluctuation of demand.
I don't pretend to be a DigitPress or the like, all of my hypotheses are based on my own observation.
However, after thinking it over again, I do not think that the values for most OTHER LaserActive games will be much affected by this project, since those in the market for purchasing the games will already have to have made a significant investment on obtaining a working unit and making necessary repairs/maintenance. These aren't like rare SNES games where the hardware is a low-cost, low-risk investment, and most of the LaserActive collectors I've dealt with are people who have owned the system since its release period. The only sore thumb in this situation is the Myst prototype - I can imagine those few who own the disc will be wary about dumping it due to a fear of devaluation (especially since the proto itself is...pretty much just a half-working version of Myst, a game ported to every platform under the sun).