Money printers, Bitcoin miners
There could be a new class for bitcoin miners, money is sort of difficult to create and make in the server, if bitcoin miners were added it would be a fun new way to make money for players.
The money printers are spoofed in my opinion, you don't really make enough money for them to be, "worth it" If they had more options and different levels of printers that would make it more worth having printers that would be nice. Also, you could add a "banker" class possible which would run and use the bank in the new map. where players could use money printers and put them in there and the bank tellers and such would keep track and control of that, just a little idea for using the map.