Thanks for the info Rodney. Haven't those lakes already got more than their fair share??
I think a major reason these lakes get so many is because they can support it. Not that they are highly productive or anything, but the fishing pressure is high enough. Most of the coastal lakes are not the greatest for productivity, and you wouldn't want to put too many trout into any one lake.
Its also a strategy to get people into fishing. Not everyone is willing to start fishing when it means driving an hour+, especially if you dont have a car. More people fishing, especially newcomers, means more money for the programs that do these stockings(because license fees pay for this stuff), which in turns means more stockings.