Koth 2 rounds, bots to fill, difficulty insane, bleed out 10, all boom shot for weapon pickups.
Have an extra console or a reliable boosting friend and then make it your profile vs 3 dummy bots and 2 ai bots. They can never win in a 4vs2 match. I can ge a few hundred per 24 hours. I never seen the bots win a single match, however they can very RARELY win a few.