By Valefor.Prothescar 2013-10-22 14:23:36
It changes the chance of finding a shiny pokemon from 1 in 8192 (0.0122%) to 1 in 300 or so (0.33%); a 170.5% increase in shiny discovery rate, or so, at least ones that can be fished. As I'm to understand, you can do something similar to this with pokeradar, but I don't know the figures for that.
So yeah, that's a loss in value. Not saying it makes them have no value, but it is undoubtedly a severe decrease in rarity, and therefor, value.