With regards to the tradeskill thing. I find the same problem with my own addon GuildCraft, something that does have benefit to the user. But, like all social addons it only works well if everyone has it installed. Heck i've added to it the ability to scan the linked trade skills and scrap that so that everyone dosn't have to have it installed just to function properly.
Anything complicated enough to use SAM is to complicated to be loadstring()'ed under most circumstances.
unfortuantely this idea is just that. an idea, it will never be practical or viable due to the fact that i could setup a addon stub that sends me 1c every time you visited the mail box, and hook and protect it to where YOU WOULD never know it was there... other than it would be listed as some random addon that's getting loadstring'ed and your raid leader said so.