2007 wiki has all the drop rates. Elysian which is 500m is 1/4095 drop rate. Arcane and Spectral are 1/1365 drop rate. Arcane is 45m. Spectral is 35m. 175 Onyx Bolts Ea is uncommon drop. They are like 9k alch ea. Every other item is good but those are the best. I think it's worth it.
Being as drops are random, you can go dry for a very long time. It's only worth it if you have some cash to burn on the supplies necessary for the boss. I wouldn't go to corp if my bank was at let's say 20m.