Farming is hitting a person more than 5 times in 24 hours.. (5 hits is the usual rule people use, not sure about others)...
Open more dorms and add more crew. The more expensive, the more it add to your stats (1k crew) Tier 1 crew- unlocked since first day of account creation (225k crew) Tier 2 crew- unlocked after opening 6 dorms (16mil crew) Tier 3 crew- unlocked after opening 13 dorms (600m crew) Tier 4 crew- unlocked after opening 18 dorms (10b crew) Tier 5 crew- unlocked after opening 18 dorms