Andy and duriel are too easy to give +2, and baal to hard(to get to him, kill 5 waves also) so +3, Diablo +2 as it takes time too. BUT again that won't somehow award players who wish to play after completing everything - by farming things, just making it a must to farm these items unless you want to suck.
My opinion is remove rolling from them - you'll find/trade 15 gcs you would want after 6months. Rolling, as many said, is the only way you could get that many gcs. I can say during this ladder I found like 9-10 barb comb - I know because I never trade them or roll over, just a trophy
11 curse gcs for that matter as I use them on my summoner