I had an idea (and yes, it did hurt). I saw a pic of a player here, who deleveled from lvl 21 to 16 to sp farm, and of course, his str and int were A LOT higher than regular lvl 16's, thus making it much easier to kill Bandit Archers.
Question. Say you are wearing lvl 21 armour and weapons. You delevel to 16, those weapons and armour are still useable and effective? (So long as you NEVER take them off). How about your masteries?
I have a feeling you won't be able to use your 'overleveled' masteries, but your stats and equipment would be ok.
Also, why stop there. If you're lvl 24 before deleveling, why not delevel to like...10? You'd still one hit the Archers (due to nice stats and equipment) and get a crap load more sp per (since they'd be a red mob after you've deleveled so much).
Does this make any sense??

and more importantantly....would it work?