Re: how do you make (cheap) chum.
Both captsam and I gave a couple of options for chumming. If on a reef and bringing bottom feeders around, you drop a chum bag down to them. I actually made up a system that follows my anchor line down so the chum feeds out under my boat. That gets the smaller fish moving and gets the bigger fish closer. This targets the bottom feeders; snapper, grouper, sea bass, grunts, etc. As mentioned in my other post, broadcasting targets top water fish. Both methods are effective in drawing a crowd!
Also, I use chum to catch the baitfish. I use a mix of Purina tropical fish food, sold to the large fish farms down here, and jack mackeral. Tossing this off the back of the boat to draw baitfish within tossing distance of my bait net. Also helps to gather a larger school of fish near the boat. So i guess "chumming" covers a lot of bases....