This questions can't be answered! When you are talking about foil core sets (and those you could not buy for a song from
WTG...) you are all over the map price-wise.
You can get lucky and sell a core set for $500-700 or you could have bad luck and sell for as low as $200-300.
The expansion foil sets are about $50-70, maybe more, if someone needs a Battle of Helm's Deep or Ents of Fangorn set REALLY bad.
Shadows is about $20,
Black Rider and Bloodlines about $20 each for the RF set, maybe $40 for the MW set.
Hunters is, again, all about who wants to buy at the time you are selling the stuff. It is basically a crap-shoot. You can go astronomically high or disappointingly low. Complete RF sets are sitting on ebay for $300, but if you sell individually - with luck - you can go higher easily. It does not make sense and you shouldn't try making any of it.
It gets even more bizarre when you talk about T&D and even MORE bizarre when you talk about RoS.
All the advice I can give to you is: either put it on ebay card per card, or hang onto it and enjoy your awesome collection. I know what I am talking about: I have a complete collection and I am happy to have clung to it this far.
Not everything is about money. Sometimes you get the highest return on something that does not give a return, IYKWIM...