We should get that plugin that pays you to do jobs like mining and hunting and fishing and building etc. It's a neat lil' way to make money, and adds some value to people that don't feel like farming. This plugin has the Cade Stamp Of Approval.
You can actually make money on the server doing these things already. You can sell animal meat using /sell and /sellall, there's an NPC at /warp fishing that buys fish (only the fish from spawn though) Mining and building can also make you money if you hire yourself to other players or sell ores at chestshops or on the auction house.
Building and mining highly depend on others, and usually are terrible profit. I think it would add a fun new aspect to the server that isn't dependent on anything but yourself.