Well from my experience I can say no need for buff since you can make more money faster with trucking but for house robberies, most of the players I see focused more on guns cause you get a lot of ammo + robbing only safes will not provide you with enough money so you go and hit the jackpot rob stuff that is more valuable so you get a lot of cash I saw players brek the 80k cash with house robberies on single run maybe start gathering a team to help you rob more stuff like 2 big vehicles able to store more items and split the profit between you guys ammo/cash