I've been reading the, "Guide to Making Money" in the guides section. I took the knowledge it gave me and started farming the Return of Skeller Krunch. I believe that's the name of it. The pinks in there are selling for about 1K to 3K a piece. Am I supposed to farm many of those pinks and sell them? Or am I missing something here? Maybe there are very rare pinks that drop? I have no clue how people are buying Demonic set pieces for 1-2 million a piece. It takes me about an hour to farm 10K direct gold from killing the spawns in Skeller Krunch + around 6K in pinks. 16K an hour isn't much.

Can somebody please enlighten me on how I am doing it wrong? I know I am.
I have a 55 pure INT mage so if anyone has any farming tips please let me know. Thank you!