Currently we have Infernal Axe and Infernal Pickaxe - These offer blood diamonds every now and then. If we can make the rate appropriate (where it's not to much in the eco, but also possible to make money off of), i feel like woodcutting and mining would make a huge profit.
Additionally, we should implement construction (Which shouldn't be hard, it's already on RuneX) - Who wouldn't want to have a badass house to host drop parties in? Eco holder's houses would be boomin and overall it's a good money making sink.
As for Agility, we can do something similar to marks of grace - how about donator tickets just randomly falls on the floor?
Little things like that would be cool to see! Your thoughts?