Philospher’s and Alcehmists’ stone need mats from mining 
as do many of “bigger” potions, stoneshield, Protection; but yes Alchemy is most “solo” proff
Just out of curiosity.
How it was explained that SF characters can’t send items through mail?
It’s self-explanatory that they shouldn’t be able to receive items or CoD money, but how exactly is sending BoE green that you have no use for (but is upgrade to the other character that wasn’t created with SF restrictions) against those rules?
If anything, it would make it slightly more difficult on getting money for learning skills, since you wouldn’t get that small pocket change from selling the item to vendor.
Also… in my opinion, you should be able to get certain profession related crafted items at small chance from treasure chest in area of appropriate level, since you already get crafting materials from those.
This changes would make me go SF I HATE vendoring random greens/blues other could happy use.