I haven't done this yet, but as NotMyWay said, I've heard decomp and comp recycling (decomping stuff, recomping, decomping, etc. until stuff is all gone) works well in building up skill production but you have to spend lots of fame on AS (alchemy stones) and not gain so much money. I guess the best way to do that is to make a new character with decomp and comp as their produc skills.
I've heard scrolls were really good sellers, but I haven't tried vending them yet xD
Just out of curiousity, what server are you on? =)