[Julia_Gillard_the_Honest]

I find Spy with Dead Ringer + Big Earner, with speed and regeneration upgrades (and sapper) better at getting money just because the bots don't attack him; unless if someone intentionally leads one away, I find that I can get all money that way.

But that's probably just a preference/playstyle and my bad luck with never seeing Scouts who aren't determined to be heroic combat scouts.