~Everybody is motivated by money or else not motivated at all. Money is potential energy for essentially any objective you might have, whether that's developing new tech or donating to charity. By cutting money out, you just select for the subset of people who are more motivated by power or status or who already have more money than they know what to do with.
It should be obvious that there's a balance between wanting enough money to live comfortably and wanting as much money as possible. Government jobs should be good enough for the former.